You would not be attaching it under the sink unless you plan on shitting in the sink. You would utilize an adapter for the toilet tank feed line. It will allow water to fill the tank and to also feed the bidet. Here is an example T valve for bidet

There are kits sold in Amazon or homedepot that have all tools and parts to connect your bidet to your bathroom plumbing. Also clear instructions.

I can't speak for all bidets. I got one from Tushy and it came with a short metal hose and T connector.

It would be no problem to hook that up to the water connectors you show there. Step 1) turn off the water supply by turning the cold water knob down in the picture. Step 2) disconnect the water hose and install the T connector where the hose was. Step 3) connect the sink hose and the bidet hose to the t connector. Step 4) install the bidet and connect the other end of the bidet hose to the bidet

At this point it should be all set up with child water going to the bidet. If you are thinking about hooking up the hot water instead you should consider some things first. How long does it take your sink to get hot water flowing when you turn on the hot water only? In my house it can take a minute which is longer than you'd use the bidet, so no point in plumbing hot water. The other thing to consider is how hot is your hot water when it gets flowing? If it's hot enough to burn think twice before pluming that into the bidet. You don't want to burn your ass.

Here is an install video from Tushy showing all the steps. https://youtu.be/jZKxmk_dIVg

I forgot to add, this is what the toilet looks like https://i.imgur.com/zP4X79A.png hence I was looking at the sink

Since your toilet is set into the wall, you'll want to tap into the faucet line instead. Simply get a splitter and add the washlet hose there. The washlet will replace the toilet seat on the toilet.

That in-wall toilet system most likely has a bidet connection, but you would have to know where it is and drill a hole in the tile to get to it.

Where it is best to attach the splitter?

If you shut off the stop to the sink you can unhook the supply line and attach here

However this is not the same size threading as a toilet valve so any included adapter will not work, a trip to the hardware store should get you sorted.

Bring the included adapter and this picture

It would go directly on the cold water shut off valve. It'll then have an identical connection at the top to reattach the faucet cold water line (looks like a 1/2" compression). Lastly, it'll have a connection on the side where you can attach the washlet hose. Until you select the washlet, you won't know what size/type that connection is. So you should get the washlet first, and then get a splitter that is 1/2" compression inlet, 1/2" compression outlet 1, and then whatever the washlet needs for outlet 2.

This was definitely valuable info. Does this toilet have an access panel on either side of it?

Do you have renters insurance lol

I have a geberit in wall toilet like yours, and when I added a bidet I had to plumb a new water supply line.

You can possibly make a T connection behind the flush actuator buttons, penetrant the cistern tank above the water level, and fish a water line down to bidet height, but it would be much much easier when installing the toilet.

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