How to properly describe & call update_operators entrypoint of FA2 token from contract?

Development
1

I have the next entrypoint which I want to use to call update_operators of other FA2 contracts. How do I properly describe the entrypoint & call it? It’s standartized so it should be same for any FA2 contract but I’m struggling to figure how to describe it properly (for example for add_operator call)

        @sp.entrypoint
        def proxy(self, token_id, contract):
            sp.cast(sp.amount, sp.mutez)
            sp.cast(token_id, sp.nat)
            nftContract = sp.contract(
                sp.record(owner = sp.address, operator = sp.address, token_id = sp.nat), 
                contract, 
                entrypoint="update_operators"
            )
            sp.transfer(
                sp.record(
                    owner = sp.source,
                    operator = sp.address("<operator>"),
                    token_id = token_id,
                ),
                sp.amount,
                nftContract.unwrap_some())
2

I figured it out:) should’ve just wrapped into sp.list[sp.variant] type