class UserFormViewModel {
    val userRepository = UserRepository()
    var userData: UserData? by mutableStateOf(null)
}

@Composable
fun userForm(
    modifier: Modifier = Modifier,
) {
    val vm = remember { UserFormViewModel() }
    onActive {
        MainScope().launch {
            vm.userData = vm.userRepository.createNew()
        }
    }
    Column(
        modifier = modifier.padding(16.dp)
            .border(BorderStroke(2.dp, Color.LightGray)),
    ) {
        formRow(above = { Text("First Name: ") }) {
            TextField(
                value = vm.userData?.firstName ?: "",
                onValueChange = { vm.userData = vm.userData?.copy(firstName = it) }
            )
        }
        formRow(above = { Text("Last Name: ") }) {
            TextField(
                value = vm.userData?.lastName ?: "",
                onValueChange = { vm.userData = vm.userData?.copy(lastName = it) }
            )
        }
        formRow {
            Button(
                onClick = {
                    MainScope().launch {
                        vm.userData?.let { vm.userRepository.update(it) }
                    }
                }
            ) {
                Text("Save")
            }
        }
    }
}

userData

UserFormViewModel

UserFormViewModel