Over on GitHub, @EricShulmanhas proposed a fabulous idea to extend the behavior of the export button in $:/AdvancedSearch filter tab β the ability to drag/drop the filter results (tiddlers) directly to another TiddlyWiki.
In my view, that simple change would make for a UX game-changer.
You can, like I did, add your support for such a feature request by logging into GitHub and adding a or to his post.
I already have a solution to drag and drop the items listed by advanced search filter, as a JSON of tiddlers or bookmarklet, for subsequent installation on any wiki.
I have revisited it of late because it is easy to use to filter large lists but harder to subsequently exclude one or more titles from that list.
To test it see https://bookmarklets.tiddlyhost.com/ and advanced search > Filter, the first icon is a JSON that can be dragged elsewhere. If clicked it does the equivalent of Export > JSON