It's much more likely that the library would do more harm than good. Libraries tend to cover broader spectrum of use cases than you'd need. Usually that's okay

It's much more likely that the library would do more harm than good. Libraries tend to cover broader spectrum of use cases than you'd need. Usually that's okay (eg: URL parsing, string manipulation, HTTP client, etc) but in cases like this the logic schema should be as absolutely minimal as possible. If you're building an interpreter and need an interchangeable format then you can always generate that out of your own bespoke and very constrained format.