(Bedrock) NPCs can't be killed by /kill @e or punching

Add a button in the NPC's UI that makes it immune to dying to players punching it or typing /kill @e. The only way to kill it is by clicking another button in the UI that says "Remove NPC" and again asks for confirmation before removing it. This prevents accidents because some players use NPCs for important reasons like me. Examples of such high usage is here: https://www.youtube.com/watch?v=5w6tqOeBZ6E