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Robert Cemper · Nov 24, 2020 
the generated file:
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<br><p>
<nobr>Klasse <b>zrcc.EX.ISOS</b>
</nobr><p>Execute InterSystems ObjectScript over ODBC</p><a name="Anchor_Inventory"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(1); return false;" class="PackageChoice" title="Expand/Collapse Inventory" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im1 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Inventory</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id1" class="DivShow" style="">
<table class="Summary" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<th align="center">
Parameters
</th>
<th align="center">
Properties
</th>
<th align="center">
<a href="#Anchor_Methods">Methods</a>
</th>
<th align="center">
Queries
</th>
<th align="center">
Indices
</th>
<th align="center">
ForeignKeys
</th>
<th align="center">
Triggers
</th>
</tr>
<tr>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center">
<a href="#Anchor_Methods">3</a>
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
<td align="center" class="private">
</td>
</tr>
</table>
<br/>
<br/></div>
<a name="Anchor_Summary"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(2); return false;" class="PackageChoice" title="Expand/Collapse Summary" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im2 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Summary</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id2" class="DivShow" style="">
<table class="Summary" border="0" cellspacing="0" cellpadding="1">
        <tr><th colspan="3" title="Bold for local member; italics for inherited; shaded for private; blue for client methods; strikethrough for deprecated.">Methoden</th></tr>
<tr>
<td  nowrap><a class="" href="#METHOD_Gset" title="zrcc.EX.ISOS">Gset</a></td>
<td  nowrap><a class="" href="#METHOD_Ping" title="zrcc.EX.ISOS">Ping</a></td>
<td  nowrap><a class="" href="#METHOD_Xcmd" title="zrcc.EX.ISOS">Xcmd</a></td>
</tr>
</table><br/>
<br/></div>
<a name="Anchor_Methods"></a>
<table class="Label" cellpadding="0" cellspacing="0" cols="1">
<tr valign="center">
<td align="left" width="100%" >
<a href="#" onclick="expandIt(3); return false;" class="PackageChoice" title="Expand/Collapse Methods" onmouseover="this.style.color = 'red';" onmouseout="this.style.color = 'black';">
    <image id=Im3 src=/csp/sys/images/ExpandedMarker.jpg height=15 width=16 border=0 align=bottom>
<nobr><b>Methods</b></nobr></a>
</td>
</tr>
</table>
<br>
<div id="Id3" class="DivShow" style="">
<a name="Gset"></a>
<a name="METHOD_Gset"></a>
<span class="external"><nobr>&#149 classMethode <b>Gset(glob As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, subs As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, val As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr> = "", dd As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25Integer">%Integer</a></nobr> = 1)</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Gset ]</span><blockquote>
set / kill global over ODBC
subs = subscript in ( )
dd = $data of source during global copy</blockquote>
<a name="Ping"></a>
<a name="METHOD_Ping"></a>
<span class="external"><nobr>&#149 classMethode <b>Ping()</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Ping ]</span><blockquote>
check connectivity</blockquote>
<a name="Xcmd"></a>
<a name="METHOD_Xcmd"></a>
<span class="external"><nobr>&#149 classMethode <b>Xcmd(cmd As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr>, ret As <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr> = "")</b>
as <nobr><a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a></nobr></nobr>
[ SQLProc = Xcmd ]</span><blockquote>
eXecute Command over ODBC
name of local variable for return value</blockquote>
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Robert Cemper · Nov 24, 2020

Hi @Yuri Marx!
I did a quick and dirty try during lunch in terminal:   

set %library=$namespace
set set %request=##class(%CSP.Request).%New()
set cdef=##class(%ClassDefinition).%OpenId("zrcc.EX.ISOS")     ; my classname
set file="my.html" o file:("WNS"):0 write $t     ;  1 if OK
use file d ##class(%CSP.Documatic).RenderClassPage(cdef,1)
close file

The result still holds references to /csp/...images  and data types  
     <image id=Im1 src=/csp/sys/images/ExpandedMarker.jpg height=. . . 
    <a href="%25CSP.Documatic.cls?PAGE=CLASS&LIBRARY=USER&CLASSNAME=%25String">%String</a>
that you might want to resolve as they are quite generic or you just ignore it .
My browser is very friendly  :-)

And that's the result:


Some polishing might be required