It is what it is

I’m learning the vocabulary 仕方がない、 and I’m wondering if the meaning is close enough to “It is what it is.” that I could put that as one of the User Synonyms.

Yes.
“It can’t be helped” is a more literal translation.
“It is what it is” has the nuance in English that nothing can be done to fix something, so its meaning is close enough.

Sweet thanks, I always know the “vibe” of 仕方がない but I always just mess up the translation just enough to count it as wrong.

I put “sikataganai” as user synonym.