Replace Tub Faucet Does Any One Know If You Can Replace A Tub Faucet With A Hand Shower?

Does any one know if you can replace a tub faucet with a hand shower? - replace tub faucet

I am a Roman bath trying to add a shower in the costs. Someone told me that I could replace the tub filled with a deck mounted on a Roman bath has a shower.

Does anyone know if this is true? What is covered?

Thank you!