The primary purpose of the CT Logs is to ensure that CAs are following the rules that they're supposed to, so they're structured mostly around their immutable properties and less around making them easy to query. The Cloudflare statistics that you found are based on them. There are some tools to search through the CT logs that I've collected in this thread:
I'm guessing the easiest way to run a traditional data processing search is to use the crt.sh public Postgres database and run some queries, but it's usually pretty overloaded. Maybe there's a better way out there, too.