You need to visit site cacombos.com where everything is given in detail(You need to confirm the model number from ecommerce website and this site, if it matches and if it has desired CA combination then you can go ahead and buy that particular device). Generally Motorola, One Plus and top end flagships from Realme, Xiaomi, Samsung also supports 4*4MIMO on all bands 3/40/41. So you can buy those. In budget only Motorola does. All the devices launched in India under 20K by Motorola has support for 4*4MIMO and 3CA.
Currently, Moto G71 is cheapest device with 4*4MIMO and 3CA which can last till 2024. Supports all 5G bands as well. With Jio you will find speeds capped on this device even on 5G, but on Airtel and Vi you can get maximum potential speeds which can network provide.