I wanted to know this also.
Those weight supporting structure or beam, they cannot be hacked.
But what I want to know is, can hole drilling even allowed on those beam?

But that wall maybe ady coming wih one socket??

aesthetic always come with the price;

If don't want to hack, just lay a wire and put another layer of plastering, this mean the entire wall need to replaster. This how some Singapore HDB is doing since thec can't hack the wall, they can plaster another artificial wall, usually doing that for hot water and wiring too.

or Make it industrial feel, expose a GI tube. Need a good workmanship.

Both method will not be cheap.

Want cheap just install normal extension, RM 30 kautim.