brevo.listContactLists returns a page of lists and membership counts.
Example
limit defaults to 10 and accepts up to 50. offset defaults to 0, and sort defaults to desc. Second argument { account } selects the Brevo binding.
Returns { count, lists }. Each list has positive numeric id and folderId, name, uniqueSubscribers, and optional totalSubscribers and totalBlacklisted. Use the ID for stable follow-up references. The action also accepts exact names but fails when they’re duplicated.