Detection function & more

I am working on a Minecraft 1.21.4 data pack and need help with a function that detects when a player is in a structure. When a player is detected nearby, the function should run specific commands via console.
I am no export in data packs so this is a commission and i am willing to pay $$$
some details:
Most of the data pack is working, but it needs some rework more, such as:

readjustment to some functions that include mob spawning, achievements, and loot tables
editing structures that generate in the world
more details in dm