A family of Microsoft word processing software products for creating web, email, and print documents.
If the "entry field" is a rich text content control, it can use the same kind of list numbering as in regular (non-entry) text. That numbering is controlled by paragraph styles and their associated list level (https://shaunakelly.com/word/numbering/numbering20072010.html). Note that one of the formats you can choose for the third level is a solid bullet.
In the Content Control Properties dialog of the rich text content control, you can specify the style that will be automatically applied to the first paragraph that the user types into the content control. Unfortunately, my testing shows that the numbering that's assigned to the style isn't automatically applied; I had to click the Multilevel List button on the Home tab and click the desired numbering scheme in that gallery to force it to appear. After that, the TAB and Shift-TAB level changes worked as in regular text.