Don't want to write this by hand? GodCraft sets minecraft:vibration_listener for you with a switch.Get GodCraftOverview
minecraft:vibration_listener is an entity component: it goes in the components object of a custom mob, or in one of its component groups. Lets the entity sense vibrations, the way sculk sensors and wardens do. It is mainly used internally by vanilla mobs.
Example
Inside the components object of BP/entities/<name>.json (values are the defaults or placeholders):
BP/entities/<name>.json
{
"minecraft:vibration_listener": {}
}