This is an experiment; I don't know whether it will be around for long and I may change it without warning, notice, or even much thought. The versioning and maintenance policy is "YOLO."
Downloading some data to work with:
This repo uses data RedHat publishes in CSAF JSON format:
curl -L -O https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhba-2021_2979.json
for example.