not ideal, but you could try the following: while your M5Stack application is loaded in UIFlow, get the rectangles, circles and triangles definitions from the python view. E.g.

rectangle0 = M5Rect(35, 38, 30, 30, 0xFFFFFF, 0xFFFFFF)
circle0 = M5Circle(93, 95, 15, 0xFFFFFF, 0xFFFFFF)
triangle0 = M5Triangle(137, 120, 106, 149, 166, 149, 0xFFFFFF, 0xFFFFFF)

then switch to M5Core2 and add those definitions together with:

from m5ui import *
screen.set_screen_bg_color(0x000000)

into an Execute Code block at the beginning of your M5Core2 application. E.g.

If you programmatically changed those shapes you probably need to put those commands into Execute Code blocks as well.

I guess one alternative is to stay in the Python view altogether or to use the shapes from the M5Core2 Graphic section.

Thanks
Felix