I just tried a bit and I wasn't able to create healing flames (not sure it was a joke or not... Everything is possible with Larian).
But yes, the healing surface is a reality.
A stupid reality because
1) it's useless, you can pick in everyone's inventory at any time
2) you can already use spells if you want to heal an ally that is not in your party
3) it's ridiculous and again, it just makes no sense. Another immersion breaking mechanics.
I guess it was too hard to implement an action to put a potion in someone's mouth... Or maybe it wasn't "fun" enough.
