SOLVED!
The script sent by Sketchup team (https://tinyurl.com/y5bzzrxz )was wrong it was specified for sketchup 18. I edited the file to make it 2019
#!/bin/sh
/Applications/SketchUp\ 2019/SketchUp.app/Contents/Resources/JSONPatchEditor HighDpiDebug DpiScaleFactor d 1.0
I even tried 0.5 and it worked
