I'm not sure if there is already an alternative to this but I made an addon that edits an Innervate Macro with the name "Direct Innervate" so that whenever u r in a Mythic Dungeon and a Healer joins or is already in the dungeon, the addon automatically updates the Macros target name to the appropriate healers name.
The Macro has to be manualy made but u can just copy pasta this:
#showtooltip Innervate
/cast [@name] Innervate
I hope this helps some peeps here that wanna push Keys :)
Because I'm crazy lazy I also created a minimap button and an interface that that allows u to choose a healer from ur raid that u wanna innervate in ur boss fights :D. Never edit your Innervate Macro with this mutating Direct Innervate Macro :D. You can also open the Interface with /directinnervate or /di.
KEEP IN MIND THAT THE MACROS NAME HAS TO BE Direct Innervate