You don’t need to unwrap wstETH separately before requesting an ETH withdrawal through Lido. Its Wrap FAQ says the withdrawal process handles the unwrap internally.

The request is denominated in stETH, even though you started with wstETH. Those are different units, so the token amount shown in the request needn’t match the amount of wstETH you submit.

Lido directs holders to its Withdrawals Request and Claim tabs.

https://stake.lido.fi/wrap