So, India has banned the import of foreign drones which I don't necessarily agree with. However for those of us who still own a personal drone and want to carry it for vacation back home, it's best to cover all the bases if you're stopped by customs.
I searched a lot for this but it wasn't straightforward to find. To fly a drone in India you need ETA approval from WPC. If I'm not wrong, this is specifically for the remote of the drone because it operates at certain frequencies. I did a search for RC231 which is the RC for my DJI mini 2 and there is already a ETA for this. Posting it for everyone's benefit.
Edit: Although this applies everywhere in India, it will be enforced most likely only at customs if they want to trouble you.