You would need to use an svg editor such as Inkscape to edit a suitable svg (I usually find some existing part with a breadboard that is close and swipe that). Here are pointers to a couple of tutorials on parts creation that may help:
Unfortunatly a closer look (and exporting the part) from the project indicates it is likely a not so good starting point, as the schematic changes aren’t reflected in the schematic svg. So I used Inkscape and 2 12 pin female connectors and your two pictures above to make an approximate breadboard view of your part (the board size may be a little off) with the appropriate pins for your part. The forum won’t upload svg files correctly so this is actually an svg file called fzpz.
So download it, rename it from svg.A6_breadboard.fzpz to svg.A6_breadboard.svg and you should be able to import it in parts editor as your breadboard. If that doesn’t work post the fzpz of your not working part and I’ll have a look at what I screwed up
svg.A6_breadboard.fzpz (38.8 KB)