Dear Hannes,
If I understood your requirement correctly, you need to make a frequency list (for a specific concordance) that will also contain the information about a structural attribute of the token (positional attribute), for instance: word + lemma + year + month
is | be | 1995 | April
going | be | 2006 | November
If this is what you are looking for, then you can use the Advanced option of the Frequency tool in the Concordance feature and here you can specify various positional attributes (word, lemma, lempos) as well structural attributes (text types) for the specific position of your concordance.
For a better illustration of what I mean, please find the attached screenshots.
You can also visit this link https://ske.li/n8u referring to the results in the screenshot (it is from an open corpus - no login required).
Best regards,
Michal Cukr