based on https://forum.plantuml.net/10498/is-there-a-supported-way-to-specify-fall-back-fonts I expected that fall-back-fonts are working. But I checked it and it is not working on e.g. the PlantUML server (details see https://forum.plantuml.net/14842/specify-fall-back-fonts-is-not-working).
Is it possible to add a funcion like %font_exists() that I can implement in C4 a macro which works with png files too (it looks like that the fallback font works only with svg which supports css).
Thank you and best regards
Helmut