I did the same for my Mother in Laws Webber grill, installed a 10' quick connect hose to their propane fitting at the back of the house so they don't have to haul propane bottles. I can't recall exactly but I think we removed and didn't need a regulator as the propane is already regulated at the connection to the house or manifold upstairs in the attic.
I had to get the correct reducer fittings for the female quick connect. Then installed the quick connect (like an air hose connection) to the house and installed the hose to the grill. It's a flare gas fitting if I recall correctly, so easy swap there.
Then just a matter of connecting the hose to the fitting and turning on when they want to use it. You could either leave it connected and shut off the valve or disconnect the hose to move it away easily for storage or cleaning in the area.
I used the natural gas conversion kit, disregarded the actual orifices that were supposed to swap if you're connecting to natural gas. I only used that because it was in stock. You can get our order just the house and connector.
Hose:
https://www.homedepot.com/p/10-ft-Natural-Gas-Hose-710-0005/206338749Quick connect fitting, it's 3/8" female thread so I have to get a 1/2 to 3/8 reducer and a 3/8 close nipple to make the connection.
https://www.homedepot.com/p/Quick-Connect-Brass-Fitting-710-0006/206338747Hope that helps.