From the perspective of Catholicism, are there or have there been any Protestant saints?

From the perspective of Catholicism, are there or have there been any Protestant saints? Is this something possible at least in principle? Theoretically speaking, could a Protestant attain the status of a saint in the eyes of God, according to Catholicism? If the answer is yes, then can a Catholic pray to a deceased Protestant saint to ask for their intercession? ____ Related but not a duplicate: https://christianity.stackexchange.com/q/92917/50422