{1: {'artist': 'Post Malone', 'title': 'Wow.'}, 2: {'artist': 'Jonas Brothers', 'title': 'Sucker'}, 3: {'artist': 'Khalid', 'title': 'Talk'}, 4: {'artist': 'Lil Nas X Featuring Billy Ray Cyrus', 'title': 'Old Town Road'}...

top100 = {}
top100.update({'rank '+str(a[0]): {'artist':str(a[1]),'title':str(a[2])}})
jsonify = json.dumps(top100)
return jsonify

{"rank 16": {"title": "Nightmare", "artist": "Halsey"}, "rank 3":
{"title": "Talk", "artist": "Khalid"}, "rank 10": {"title": "Sweet But
Psycho", "artist": "Ava Max"}}