Hi Francesco,
Just to confirm, you're talking about replacing the LED chip that generates light for the camera flash operation and the flashlight, is that correct? The one circled in green in this picture?
[image|3386189]
If that's what you mean, then yes, it is certainly possible given the proper tools and experience and access to a replacement part. The best way to find the right part would be to locate the schematic diagrams for the phone and hopefully they will have enough information to identify the correct part. Otherwise if you can't find anything with an internet search, you could end up having to buy a donor board in order to harvest the part from it to use as a replacement.
It's hard to say from that picture whether it would be possible to remove the LED chip with a soldering iron or if. you would need to use a hot air station instead. I would imagine most professional repair shops would be able to do that if it's outside of your comfort zone for repairs.
I note that we don't have a guide for removing the motherboard here on iFixit, but the Spanish site Nadie Me Llama Gallina has what you need.
[link|https://www.nadiemellamagallina.com/en/manuales/smartphones-1/samsung-4/samsung-galaxy-a52-1295/placa-base-11564|Manuales / Samsung Galaxy A52 / base plate - Nadie Me Llama Gallina]