Android Looking for a Budget 5G Phone Under 20K Strictly for Product Photography

You may get a used S22 (Snapdragon processor): has good camera and 5G. Even an iPhone but S22 has a better camera IMO than iPhone 12 that will be available at this price. Otherwise there are no good phones with these two under 20K.
 
I would advise against Moto phones on a budget because they have random heating issues while doing any heavy processing tasks like Camera, Editing, etc. Most of my family members who use Moto budget phones are pretty annoyed by that.

Your best bet would be a second-hand iPhone that's a bit old and in your budget, or getting a Samsung.

I don't know what the products in question are about, but I drive an Honor x9b daily, and it's pretty nice to capture the textures of food I make that I frequently like to record (I am a Chef). It has a nice macro mode as well which I enjoy using. My only issue is that it's piss poor in low light but I guess that wouldn't be a problem if you are going to get some lights and setup stuff for the product shoot.

Check these pics out from my gallery (they have been color-corrected in Snapseed a bit):