How to call resultLauncher that exists in the activity from a composable function?

Question

I'm trying to implement One-Tap together with Jetpack Compose. The startDestination in my NavGraph is a screen called AuthScreen. Inside the ativity I have defined a launcher like this:

class MainActivity : AppCompatActivity() {
    private lateinit var resultLauncher: ActivityResultLauncher<IntentSenderRequest>

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        resultLauncher =  registerForActivityResult(ActivityResultContracts.StartIntentSenderForResult()) {
            if (result.resultCode == RESULT_OK) {
                //Do stuf
            }
        }
    }
}

And inside the AuthScreen I try to sign-in like this:

fun AuthScreen(
    viewModel: AuthViewModel = hiltViewModel()
) {
    Scaffold(
        topBar = {
            DarkTopBar()
        }
    ) {
        Box(
            modifier = Modifier.fillMaxSize().padding(bottom = 48.dp)
        ) {
            Button(
                onClick = {
                    viewModel.oneTapSignIn()
                }
            ) {
                Text(
                    text = "Sign-in"
                )
            }
        }
    }

    when(val response = viewModel.oneTapSignInState.value) {
        is Response.Success -> {
            val beginSignInResult = response.data
            val intent = IntentSenderRequest.Builder(beginSignInResult.pendingIntent.intentSender).build()
            //resultLauncher.launch(intent) 👈 Here is the problem.
        }
        is Response.Error -> print(response.error)
    }
}

But I cannot use resultLauncher since it's placed in the activity and not inside the composable function. Both exist in different files. How to call resultLauncher that exists in the activity from a composable function?

Or is there a better way? For example, to move the resultLauncher inside the composable function? Any ideas will highly appreciate it. Thanks