Ideas for fanfiction Game of thrones A song of ice and fire JonSa

"Jon was healed by the burial fire, but had lost his memory and his hair became white (or silver, like Targarian')"
Set after Jon's death.
What if Jon didn't die completely (only a clinical death), he was healed by his own burial fire, made literally after lord commander's death (and became a fireproof partially and that lasts some minutes or more).