Using own icon fonts in pagebuilder

Hey together,

i am using your Bold Pagebuilder and I love it.
Now i want to build a own theme and need some more icon fonts in the page builder.

I found an instruction to modify some files and so on, but I tested it and with the next plugin update everything was gone again.

Is there any way with a hook or over the functions.php of my theme to add new icon fonts to the bold page builder?

thx for your help!
PS: I dont use any of your premoium themes, i build all my themes by myself ??