I've released another beta version of Embed Wikimedia, with support for three blocks for the WordPress block-editor (Commons, Wikipedia, and Wikidata). There's still work to be done on their interfaces, but before tackling that I want to sort out support for captions from Structured Data on Commons. There's a few other bugs too (and I'm sure I'll write more before I'm done).
The annoying thing about blocks, I'm finding, is that I still write a fair bit with the Android WordPress editor, and so still do old-fashioned embeds where they're just a bare URL on its own line. I feel like the blocks get away from that simplicity (although, internally, so far they're exactly the same functionality).