I’ve done roughs of a couple of clips that I’m now editing into a short, so inking is the next step. I saw that paint layers was being worked on last year, and also just today noticed that layers are vector based, so now I’m very curious if I can get the xml <strokes> into some other format for compositing!
We might be able to do a vector exporter at some point (it’s on our list). But for now, your option is to export as a sequence of png files or a mov prores file with alpha. If you need it at a high resolution, you can go to File -> Scene Settings, to change to a higher resolution as a final step before you do the export. While scaling up, AP will re-render everything, so all lines and drawings will be at full res and super crisp.