Hi HN, I'm one of the authors of Ohm. Happy to answer any questions you have.
We've been on here a few times before:
• Ohm – A library and language for building parsers, interpreters, compilers, etc.: https://news.ycombinator.com/item?id=26603393 (March 2021)
• Ohm - Parsing Made Easy: https://news.ycombinator.com/item?id=15491336 (Oct 2017)
You might also want to check out WebAssembly from the Ground Up, an online book we're writing that uses Ohm to teach you WebAssembly: https://wasmgroundup.com