Is there a way to simply filter all of the routes and stops by county?

[dmitrykinakh]

We are building a real estate map and one of the things we are interested in is loading transit data (Systems -> Routes -> Stops).
There were no issues with loading systems filtered by the county. However, it looks like such an option is not available for routes and stops. It means, that to load all the US data available on Transit.Land we need to specify all 636 onestop_id that we got on importing systems. That looks a bit complicated and not flexible. Could you please let me know if there is another option?