Hi Emerson, i think you have two options, either use images or SVGs as icons, you can take a better look about it here:
https://docs.inductiveautomation.com/display/DOC81/Images+and+Icons+in+Perspective
I think the Use a Custom Icon Repository part will be especially usefull for you.
Now about the icons, there's this post where @dan123 provided a link that i also think will be of use: