Replace Superuser With Magsik?

[ndeso17]

I use GSI on my phone, the GSI I use is system-squeak-arm64-ab-gapps. How to replace superuser with magisk from this GSI?

I mean this is not familiar to me, so I feel that using superuser is like an imposition on me. That doesn't mean SuperUser isn't good, but I'm not ready to use it yet.