Most users seeking "custom firmware" are looking to bypass ISP restrictions or gain features like advanced traffic monitoring, which Jio has recently removed in official updates like OpenWrt & Third-Party Builds
Plug the third-party router into the Jio ONT via Ethernet and use the Jio router solely as a bridge. Are you looking to install specifically on an model, or are you trying to repurpose an older ONT gateway custom firmware for jio fiber router top
