Found this on a youtube recommendation, and it seems like something people here would find useful!
Relevant video: https://www.youtube.com/watch?v=KS7JELHvQW0
Download Link: https://moritzmolch.com/apps/comiccreator/index.html
Really nice for quickly making some frames without having to worry about alignment!
Note though that the .kra files are generated as greyscale/alpha, so if you want color, make sure to change your colorspace in image properties, and to select it in the color picker.
It looks nice. Too bad it is a standalone tool, I would have loved to see a Python script in Krita doing that.
I still dream of such script where you have a global frame and you can trace a line between two lines (of the frame initially, and the created sub-frames later) and you get a nice gutter along this line.
I still have to learn Python and the Krita API to be able to do this myself. If it is possible at all currently.
On the other hand, generating a SVG in a Web application to be imported in Krita is in my field of competences… Just thought of that. It would take the route I criticized above, but at least I can do that. 