There is a new feature: Docker container's plugin from Qt Creator.

• Choose Docker as a build device.
• Choose tools -> options -> Python -> Add -> executable
• Set docker://boot2qt-raspberrypi4-64:6.4.0/usr/bin/python3 as executable

And now I am trying to run Qt Python application from container docker://boot2qt-raspberrypi4-64:6.4.0 and receive the message ->

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16:53:03: Starting docker://boot2qt-raspberrypi4-64:6.4.0/usr/bin/python3 -u /home/tatiana/Qt/untitled1/main.py...
bash: line 1: cd: /home/tatiana/Qt/untitled1: No such file or directory
16:53:03: docker://boot2qt-raspberrypi4-64:6.4.0/usr/bin/python3 exited with code 1

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But project is placed by path: /home/tatiana/Qt/untitled1/

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"/home/tatiana/Qt" mounted path for boot2qt-raspberrypi4-64:6.4.0 docker  container in device settings.