Passphrases are not stored anywhere, you need to remember it. read next reply
Thanks for correcting me, I edit it.
This is not about own standalone wallet, but about own standalone wallet, which allows to enter the passphrase in order to access a hidden wallet. Well, probably not all wallets support the phrase input function and hidden wallets, right?
Hidden wallet is just a marketing term as I would call it a password wallet, seed extension, 13th word, 25th word or whatever it is it is not related to hardware wallets or Trezor but rather an additional protection option against physical attacks.
In the sense that the seeds are safe against brute force attacks, but if you are afraid that these seeds will fall into the wrong hands or want additional security, you can try this feature, which is a restrict access defined by BIP-39 standard with wallet seed itself.
You need to set it up during wallet configuration, so any wallet that supports this feature will give you access to your Trezor hidden wallet.
https://iancoleman.io/bip39/ can help you to access your private key/MPK from that seed+passphrase and import it to any wallet (not recommend)