Loki derived fields filtering or aggregation


I have just deployed a loki to store my application logs, with 2 labels, host and process. I haven’t created more labels so as not to saturate the number of chunks, and after reading about derived fields, I thought I could use them to group the logs. After creating the first derived field “status”:

I see that the new field is created in each event:

But I see no way to operate with this new field, and I can’t use it to filter, nor to add, … etc.

I have read that they can be used to link to other data sources like jeager; but can I use derived fields to filter or aggregate events? I don’t understand why not, if the field appears with the rest of the labels.