You can make it! There is already lishogi.org for shogi (Japanese chess) and lidraughts.org for draughts. They took the code for lichess and tweaked it for their respective games.
Thank you for pointing out this out and making it click in my head that what they're doing could be done for other games.
I've got one or two game designs of my own that I could probably make something like this with, but it didn't really click I could use this code as a reference until then.
Will probably be a while before that happens, if it happens, but I'll put down your email just in case.
I do have other game designs I'm working on and a different version of the game I'm thinking of that is aimed at a bit more of a casual audience (even putting Twitch streamer friendly things in there), but I do hope to get to a point where there can be some real data on how to play well in the game, and it is basically a board game anyway (I have a physical prototype for the board game version made, but it's never been published).
I've got one or two game designs of my own that I could probably make something like this with, but it didn't really click I could use this code as a reference until then.