Hello! Huge fan of `pv`. I use `pv` daily in multi-process pipelines and streaming between child processes. Currently, I'm looking to programmatically monitor `pv`'s output in my automation scripts to drive a multi-node work coordinator. **Feature request:** - Add JSON output formatting through a new flag (e.g. `--json`). This would provide machine-readable output that's reliably parseable (JSON detection can start with a simple `{` check, unlike parsing stderr for a custom format which may contain other messages). **Alternative suggestions:** - Extend `--numeric` to work in combination with custom format strings. It seems like these two don't work in combination (at least in the version in Ubuntu/Debian). - If one could pass a JSON template into the custom format, and `--numeric` would pass raw values ... it might not be necessary to natively support this. **I'm interested in contributing this feature if you're open to pull requests.** Would appreciate guidance on: 1. Preferred JSON library (if any) vs simple string templating 2. Any specific format requirements or preferences ### 🎉 Thanks for maintaining this essential tool!