Jonah Judah from Bojack horseman is very clearly autistic, but it's never mentioned or even the source of any plot point. He's just a regular character who happens to be autistic and has his own plot things and stuff.
I think you mean Judah from BJHM. AFAIK that show doesn't have a character named Jonah.
But Jonah from Ozark is also fairly autism coded although it's only ever directly implied once in the first episode when he's called r*tarded by his sister