The best way to do this is to make a Lua script. The Android version supports Lua scripts just like vanilla does. Getting them onto your phone is the only hard part, since there is no interface to do this. Modern versions of Android also block you from accessing tpt's data using file managers.

Usually tpt's data folder would be /Android/data/uk.co.powdertoy.tpt/files/
If you manage to copy a file there, or download it from the console, then you could have scripts on Android.

You can also install the script manager and download scripts there. This won't help you make scripts, but you can run existing scripts.