I don't know if it will work as a general solution, but this works as part of
the contacts things I have at inmysocks.tiddlyspot.com
I am on a phone so I can't really test it in the context of a normal url, but
the link works in the contacts stuff. I think the combination of the set widget
and the macro is the important part, but I am not certain.
\define getAddress()
mailto:$(address)$
\end
<$set name=address value={{$(tiddlerName)$!!$fieldName$}}>
<a href=<<getAddress>> target="_top">{{$(tiddlerName)$!!$fieldName$}}</a>
</$set>
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