Bluetooth Control of Servo motors through app

#1

Hi,
I have been making a chunx (find it on thingiverse) robot which uses two 360 degree servos motors as wheel drives.
I wrote some scratch code to control the servos using the hardware joystick.
All good that works fine. Now I want to control it from the makeblock bluetooth app.
Unfortunately the app only allows control of motors from the on screen joystick and not servos.
Servos can only be controlled independently and that’s not what I want. So the question is what is the best way to go about being able to control my bot from bluetooth app on the phone?
Is there a way for the make block app to do this? Otherwise there is a communication block in mblock which I assume means you can send to commands to it via bluetooth and do with them whatever you like. However I’m not that keen on writing an Android app for it, so does anyone know a existing app that can do what I want or a way to make or modify another that’s not going to have a huge learning curve.
I am assuming this may have already done somewhere since these are STEM bots.
Thanks.

#2