Numbered list in Rise -- Letters?

Hi, I see there is a way to edit the numbered list (I found a post that showed adding an image after number 3 and then continuing the list after the image by changing number 1 in the second numbered list to 4), but I tried to edit it to a letter....I want it to be A, B, C, D, E rather than 1, 2, 3, 4, 5.  It lets me change it in the edit mode but it switches back to numbers when I exit edit.

I know it is called a numbered list, but if you can edit the numbers can I edit it to a letter?  

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