Unfortunately it's not officially supported (as usual in CRA world), so you have to resort to one of the config rewriters. I've been using this⁰ and only had one problem with numeric enums in TypeScript. I don't remember the exact issue, but it was caused by my own stupidity, and was easy to fix.

[0] https://github.com/pradel/create-react-app-esbuild/tree/main...