based on https://forum.plantuml.net/10498/is-there-a-supported-way-to-specify-fall-back-fonts it should be possible to define multiple default fonts. But I think it is not working. I tried it with following
' not working
' skinparam DefaultFontName NotExisting, Courier
skinparam DefaultFontName Courier
[Room] --> [Chair] : "has several"
Did I oversee something?
Thank you and best regards