These datasets are collected by the script Earthworm.
Each zip file contains JSON files with all ads classified as “political and issue ads,” containing COVID-19 related keywords in all countries where FACEBOOK Inc. platforms (Audience Network, Facebook, Instagram, Messenger, Whatsapp) make ad transparency measures available.
Each JSON file contains a maximum of 10.000 ads.
Data is archived in the form of a historical take collected on xx-yy-zzzz, and month-wise daily collection in the respective folders.
For more information on the scripts and the datasets, see here.