Each subdirectory here (ie, subdirectory of)
  https://www.chiark.greenend.org.uk/~ian/docker-tags-history/
contains a daily fetch of
  https://registry.hub.docker.com/v2/repositories/$repo/tags

The subdirectory for some repository $repo is the repo name
but with all slashes replaced with commas.

You can fish out information for a particular tag with
something like this rune:

  zcat tags.2023-09-04T13\:07+00\:00.gz | jq -r '.results[] | select(.name | match("^nightly-bookworm-slim"))'