A compiler for X86 and ARM at the same time

I'm thinking about making a compiler for C/C++ that can generate code that works on both X86 and ARM, am I sure I can make it? honestly not at all, I never really had interactions with inside of compilers but I think it's a fun project and may be possible. What do you guys think? I honestly want this because I believe the main reason some developers mostly avoided/avoiding ARM support is because of the extra work and adoption, but I'm also a fan of ARM in general so I want it to be more acknowledged.

As first thought I'm thinking about tweaking Fat binary method, but surely we will see changes in decision if it doesn't work out like planned, I'm planning for a rather less size while maintaining performance.

I'm planning to start the project in about 1.5-2 weeks, if you are interested and want to contribute to project or even just follow it to see how it's going, I would gladly make a GitHub repository and a place specific for this project in Discord or something, and of course will gladly share the progress here as well