These may be served from the same domains that serve the content, which makes it difficult for Pi-Hole to block, since Pi-Hole is a domain blocker.
These tools will help you determine where the ads are served from. If they come from the same domains as the content, you may need to add a browser-based ad blocker (uBlock Origin is one), which may be able to block the ads. Or, if the subdomain for the ads does not change, then blacklist that subdomain.