Distriibute aap or ipa for ios simulator testing

Hello

So, we are currently working with maestro for e2e testing. We are using firebase distribution for distributing apk/ipa to our QA testers. The maestro e2e testing is independent to our code base and we use firebase builds to test it. However, Since iOS simulator only works with .app and firebase does not allow .app. builds, How do you guys test your e2e suites in iOS. Do you guys have any options or advice on this ?

Thank you