MainActivity.kt

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val mockUserProfile = UserProfile.getMockProfileUser()
        setContent { MainActivityComposable(mockUserProfile) }
    }
}

@Composable
fun MainActivityComposable(userProfile: UserProfile) {
    Surface( ... )
    { ProfileCardComposable(userProfile) }
}

...

@Preview
@Composable
fun UserProfileCardPreview() {
    val mockUserProfile = UserProfile.getMockProfileUser()
    MainActivityComposable(mockUserProfile)
}