Just because I prefer transclusion to macros:
Create a template tiddler (say “tTwDoc”) with the following content:
<$list filter="[<currentTiddler>!match[tTwDoc]]">
<iframe src={{{ [<currentTiddler>encodeuri[]addprefix[https://tiddlywiki.com/static/]search-replace:g[%20],[%2520]addsuffix[.html]] }}} width=100% height=300px/>
</$list>
(I don’t know enough about encodeuri and why it wasn’t enough, requiring me to replace any occurence of %20 with %2520.)
In whatever other tiddler, enter the following:
{{Tables in WikiText||tTwDoc}}