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Many former Soviet and former Yugoslavia nations did this.

I ran the question by AI, and it seems to think that somewhere between 30-50 since WWII have done so explicitly.

>>throwa+(OP)
Seems fair to call those ethnostates as well.

Edit: I asked ChatGPT "How many nations have declared themselves to be the Nation-State of a people?" earlier and got the same answer as you. I asked again just now and got "Israel is the only nation in the world that has legally declared itself the “Nation‑State of the Jewish People.”" [I didn't specify Jewish]

Can't rely on AI.

>>throwa+(OP)
You should consider that AI is often wrong and stop using it as a source of truth.