We've just updated our Seznam connector and added a new report type, Adgroup. This report contains the same metrics and dimensions as the Campaign report with the addition of Adgroup ID and Adgroup name.
In order to access the new report you need to connect a new data source, or edit the configuration of an existing one, and select the Report level Adgroup. To find the full list of available fields, please see the article What data can I get from Seznam?