Scott,
That’s a really tough Question. I stay away from trying to remove gum from asphalt. You cannot use high pressure on the concrete. Heat is also bad for the asphalt and the types of chemicals that break gum down will also hurt the asphalt.
Can it be taken up safely? Yes low pressure being very careful not to take any asphalt with it.
If someone has a safe effective chemical they could sell me about 110 gallons.