Assuming you have a facelift model, then you can’t have the MMI display if you only have rear parking sensors.
if you add OEM-equivalent front sensors then you do get the parking display. You can buy upgrade kits from various sources. Cheapest is via AliExpress, which is where I got mine. Pays your money and takes your choice. Quite a lot of work involved in fitting, including removing front bumper and punching holes for two of the 4 sensors. You also need to fit new 8 channel PCD module, dash switch panel and wiring loom. These come with the kits. Oh yes, and you will need to do some recoding using VCDS. There are guides if you search the forum.
hth
Mike