Finding an ELF for obscure games

Hello team.

Wanted to ask you all about the requirements for needing an ELF file to recompile n64 games. It is mentioned in the readme that..

Currently, the only way to provide the required metadata is by passing an elf file to this tool. The easiest way to get such an elf is to set up a disassembly or decompilation of the target binary, but there will be support for providing the metadata via a custom format to bypass the need to do so in the future.

For games like Mission Impossible, I was wondering if there is a proper way to actually recompile an elf file, or if the team has found that custom format mentioned in the readme. Hope to hear more soon!