Hello,
I've tried api('getSource'), modified the resulting SIGNALS key names, then api('applySource'), but unfortunately, it doesn't appear to be possible to change Net Names. Doing api('getSource') afterwards doesn't reflect changes made.
I'd love to be proven wrong!
Edge Chromium
91.0.864.48
OS X
10_15_7
EasyEDA
6.4.19.5