The prerelease has just received an update to the Geospatial plugin to allow custom interactive wikitext popups to be added to maps.
You can read the docs and try out the improvements here:
https://tiddlywiki.com/prerelease/plugins/tiddlywiki/geospatial
The demo includes a number of example geo features, each with their own custom type of popup.
You can review the changes in detail at GitHub.