Support [Parquet](https://www.databricks.com/glossary/what-is-parquet) file format as an alternative to CSV for save / export. Features compression and better support for nested objects (arrays, structs). Not sure what library is best for JS/TS, I saw [hyparquet-writer](https://github.com/hyparam/hyparquet-writer) and [DuckDB](https://duckdb.org/docs/stable/clients/node_neo/overview.html) suggested.