I agree, but what are you trying to achieve and why in this interior situation? is the ultra high gloss a look you want or do you need it for protection or something?
You can use either paint store or artists store clear gloss acrylic coatings to get as high as possible. Just don't rush things and let the paint and subsequent layers cure. MAB sells gloss acrylic interior paints that are nice but they do not hold tints well so if you have a dark color in mind you will be out of luck.
Oil based paints will have higher gloss to start but will chalk over time and because of the VOCs you should probably not be using them inside where people live. This is the reason you cannot get them in parts of the US as a homeowner.
Silicon or epoxy alternatives will not give you that more gloss and if you use them on a wall, they wall chip.
Never tried it but I guess you could prime well and try a melamine paint.
These folks may have ideas. I have used their products.
God help you with some of these approaches if you change your mind in a year or two.
Would a sheet of vinyl be glossy enough? You can have those output in wall widths at your local large output graphics store in whatever color or creation you and your computer can come up with. Apply it, protective gloss coat it, take it down with a hair dryer when you tire of it.