This is probably a lot simpler than what you're thinking of, but just in
case it helps.
Populating a data tiddler:
<$button>Ref by Captions as Data Tiddler
<$list filter="[tag[HelloThere]has[caption]]">
<$action-setfield $tiddler="MyDataTiddler" $index={{!!caption}}
$value={{!!title}}/>
</$list>
</$button>
Two important caveats.
1. You need to create the tiddler in advance as a data tiddler, unless you
want the data saved as a json structure.
2. action-setfield will wipe out all data entries so far whenever it
encounters an $index that is empty. So make sure $index has a value.
Saving a list
<$button>Create as List
<$action-listops $tiddler="MyLists" $subfilter="[tag[HelloThere]]"/>
</$button>
This actually adds to an existing tiddler's list field (or creates one if
it doesn't exist). If you want to write over the prior list field contents,
then use:
<$button>Create as List
<$action-listops $tiddler="MyLists" $filter="[tag[HelloThere]]"/>
</$button>
Apologies if this was not what you're looking for ...
-- Mark
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