No answers yet, though digging into KiCad’s source repo, it looks like the functionality may be available in their next major release (6.x).
Alternatively, after reviewing the Gerber File Format Spec I’ve been wondering how difficult it would be to convert an existing Gerber copper layer file to convert copper region statements into a series of interpolate statements converting the filled zones into copper traces of the region outline plus the hatched pattern.
The advantage to this approach is that you could take a standard Gerber output (like something you’d want to send to a PCB fab) and just apply the conversion to create a modified Gerber specifically for fabricating on the V-One.
However, I haven’t gone deeper to understand all of the challenges with this approach. I might take a stab at it sometime as a fun spike exercise. Is Voltera thinking about adding this support to the V-One software itself, or is it not on your backlog?