Jun 18.2019, 09:12:03
Epoxy plugged vias wouldn't seem to do much for thermals; don't you want them to fill with solder? Is the plug resin a thermally conductive epoxy?
As mentioned, there is no official formatted method to denote this; it goes on the fab drawing. PCB fabs -- the good ones anyway -- do in fact read all the notes and try to comply with as many of them as possible.