After some thought: you could have also asked whether it's possible to add new data sources that you need to query, and the answer is of course yes! It's actually quite simple and there are many examples. Each data source tool is just a plugin implementing the appropriate interfaces. You can look at some example projects and see how they implement their data source here:
https://github.com/Puchaczov/Musoq.DataSources
This will output pure json or csv. This way you can use other tools like jq, grep, csvtoolkit or whatever you need further process your data.
to dig deeper, just look at: https://github.com/Puchaczov/Musoq.CLI
After some thought: you could have also asked whether it's possible to add new data sources that you need to query, and the answer is of course yes! It's actually quite simple and there are many examples. Each data source tool is just a plugin implementing the appropriate interfaces. You can look at some example projects and see how they implement their data source here: https://github.com/Puchaczov/Musoq.DataSources