How to acquire and process historical data from LDI?

@opeeters asked the other day

I have a question concerning the functionalities of what we have at the moment. Is it already possible to download data of a Luftdaten sensor via the grafana GUI?

A colleague of mine would like to download the data (since somewhere beginning of February) of 8 LD-sensors we have hanging next to official stations for further analysis in e.g. R. I can easily make a dashboard using the LD-id's but is there a download functionality.