Do you mean a car wash toilet, as we call it? A wash and dry for your nether regions??
We have one. There is the great big ugly and space consuming one starting with the letter G but you can also have a bidet toilet seat, which has the same functions, and can be fitted over a normal toilet. Choose a comfort toilet, which has a higher bowl/pan, and this fits on top. Make sure that they plumb the water tank for the wash function into the mains which means you don’t ever have to top it up.
We had our shower room converted to a wet room, hope that you are doing the same with your refurbishment. Future proof whatever you are doing. Level access, not those that you see advertised in the press, they have a lip which would be impossible if using a wheelchair. An AKW shower, specifically designed for use by carers, it also has a remote control, so that the water temperature is not affected by someone else using hot water. Underfloor heating for those times when you don’t need the house heating on.
Find a good installer that goes through all the available options with you.
Best of luck and if you have any more questions, please ask. We got it mostly right but there are still some things that are not 100% perfect but it is a godsend for ease when showering with a shower chair also available when necessary.