I have been searching for some time and found FlashForge_Creator_3-and-Pro-Cura-profiles to work with my FlashForge Creator 3 Pro and Cura 5.3.0.
The only thing I needed to change was the regex used to remove the decimal places from temperatures, because it did not include M140:
in Extensions -> Post Processing -> Modify G-Code
add Search and Replace with these arguments:
search:
M(104|140) S(.+)\.0
replace:
M\1 S\2
Btw. I'm using PrusaSlicer-FlashForge for the FlashForge Creator 3 Pro with Prusa Slicer.