Enumeration in ONE text cell?

Is it possible to have an enumeration as an integral part of a text cell, so that they all together form one cell?

Reason for this question: I would like to have a text cell (e.g. for a theorem) and then I would like to enumerate the conditions under which this theorem is applicable. Then I would like to assign a background color to this whole text cell.

When I use “Item” or “ItemNumbered” or “ItemParagraph” it always creates new text cell and when I assign a background color there is this “white space” between the lines. But I want to have it “as one cell”.

Any idea how to realize that?

THX, JJJ

enums in notebooks.nb (1.82 KB)

Crossposted:
https://mathematica.stackexchange.com/questions/275567/enums-in-one-text-cell-of-a-notebook