I have just read this tweet: https://twitter.com/DraftSight/status/1021726724118274049
Presumably, this would allow you to pull a PDF drawing (say) into DS and vectorize it before exporting to SU. I know there is other software out there that does this but it’s too expensive for occasional use.
When I stopped using AutoCad and started using SU in earnest, I switched to DraftSight as a free 2D AC clone. I only really use it now for viewing DWG files and amending legacy drawings, but I shall be keeping an eye on this development as it could hugely speed things up if it works.