Hello,
right now it is not possible to tell, if a campaign_label is set or not.

We have the schema campaign_performance_daily_report, campaign_label_history and label_history.

- campaign_performance_daily_report does not have any informations about the set labels
- campaign_label_history does not have any informations about, what label is set right now. You only have the information, which label was modified but you don't know, if the label was added or deleted.
- label_history has the information, that a label is active or not. But this is account-wide and does not say anything about, if the label is set in a specific campaign.

Here https://learn.microsoft.com/en-us/advertising/bulk-service/campaign-label?view=bingads-13 I can see, that there is a column for Status in the campaign_label so it should be possible to tell, if a campaign label is active or deleted in a specific campaign