For graphics/gmic-qt stay:
"G'MIC-Qt is a versatile front-end to the image processing framework G'MIC.
It is in fact a plugin for GIMP, as well as a standalone application."
I did compile withut problem but there are no plugin for GIMP. It is just plugin for Krita. And there is no options to choose which plugin.
Yes, this port exists only for krita, not for anything else. You can select the filter in krita's menu, which will open the filter dialog.
What is exactly your question :)
Is this related to PR 244162 ?
As I poste before "...It is in fact a plugin for GIMP..." which it didn't installed and citation was posted from KDE team.
This will be fixed by implementing 244162.
*** This bug has been marked as a duplicate of bug 244162 ***