Basically I’m planning a Possessed Oracle Demon and wondering if there was anything in the Mythic Path to help me as a healer or if I have to focus on cc and dps instead.
As far as Healing goes, you don’t really need help from a Mythic Path for it.
Healing is a viable in combat action once you get the Heal spell, and its close enough to a full combat heal that additional support isn’t needed.
The better strategy is generally to set up for damage avoidance and heal only in emergencies… which Demon will be fine for. No synergy, but none needed.
Some paths give healing and condition removal to classes that don’t already have it, but that doesn’t apply to you as an oracle.
Out of combat healing also isn’t really contingent on mythic path.