Hey there is a related „Font Awesome Pro“ element coming from Bricksforge. Bricks has no official API yet to extend the native icon list, so you need to use the Bricksforge element instead.
After activating it, you should find the „Font Awesome“ element in the Bricks element list (in the „Bricksforge“) category. Just add the element to the canvas and use your pro icons
These guys were able to hook into the bricks panel to display the icons. I think this would be a worthwhile upgrade to use this method, and allow bricksforge users to pick from the icons in their kit.
As there is no official API, the only option is to hook in via detours and workarounds. As soon as Bricks changes something here, this would lead to problems. I’m not a fan of hacky solutions, I’d rather wait for an official way to expand the field…