Just to keep you in the loop, @Aurelie_Pureur & I are working on the subject, mainly using tricks from here : MEGA TRICK: SVG in Coda (one step away from generated charts and mind maps!)
For now, the use of external svg image base 64 code (background map) is very unstable as the image get complex (even in this one I get crash if I want to refer to the โFinalโ table outside of it). I would have been glad to be able to call for external classic image, like you can do in classic svg outside of coda (opened a subject here, but not possible for now : Overlay image and SVG created in CODA, which is a pity !)
Well, it was the opportunity to start working on svg creation, which is quite incredible. As long as you only use basic shape, itโs really efficient !