How to create numbered sub-lists in Mail application? Is it possible to create nested numbered lists in MacOS's Mail client? —e.g.:

1. Foo
    1.1. Foo is cool
    1.2. Foo is great
2. Bar
    2.1. Bar is not so cool
    2.2. Bar is not so great


I've been trying but all attempts so far have failed. This is very basic stuff. There must be a way.

I'm using MacOS Sierra (10.12.6) and Mail version 10.3 (3273).
In the Mail app go to the Format menu and click on lists and then on 'insert numbered list'. Go to your mail and enter text for the 1st item in the list. Now go back to the Format menu item and click on lists again and this time click on 'Increase List Level'. This will create sublists. See image below.



To go back to 1st level use Format/Lists/decrease list level.  You can create as many sublevels as you desire.