I don't think there is a 'best way'. There isn't any convenient shorthand
for {{!!fieldname}} for anything other than the tiddler listed in
currentTiddler. If you have to reference both the containing tiddler and
the current tiddler in the list a lot than you can make a macro like this
\define containingTiddler(field) {{$(containingTiddler)$!!$field$}}
and then in you could do this (example for tiddlywiki.com):
<$set name=containingTiddler value=<<currentTiddler>>>
<$list filter='[tag[HelloThere]]'>
<<containingTiddler title>> - {{!!title}}<br>
</$list>
</$set>
so inside the $list you use <<containingTiddler fieldname>> instead of
{{!!fieldname}} when you want the containing tiddler.
It is far from perfect because you have to make the set widget outside the
loop each time (or once in the tiddler, it could contain everything else in
the tiddler). If you put the macro in a tiddler tagged with $:/tags/Macro
you can have that define once for your whole wiki.
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