A GEGL utility gegl_command_line.py that comes from the Windows samj portable Gimp 2.10 https://samjcreations.blogspot.com/2020/10/
This uses the GEGL executable, for Windows gegl.exe which comes with samj Gimp 2.10 and for linux gegl can be installed from the linux repo.
Trivial example: Gimp 2.10.20 / kubuntu 18.04 using two GEGL operations newsprint and engrave in the same command line.
Only strangeness I can see is GEGL writes both original file and modified file to your home folder
This uses the GEGL executable, for Windows gegl.exe which comes with samj Gimp 2.10 and for linux gegl can be installed from the linux repo.
Trivial example: Gimp 2.10.20 / kubuntu 18.04 using two GEGL operations newsprint and engrave in the same command line.
Only strangeness I can see is GEGL writes both original file and modified file to your home folder