Semantic Lists (ordered and unordered) provide orientation for users by organizing information in meaningful ways.
Lists need to be formatted using the list tool.
Create bulleted and numbered lists using the formatting options in the Brightspace editor.
Using the built-in formatting options ensures that screen readrs will read the content in the correct order and identify structured text from body text. If the text is not formatted using this tool, a screen reader will read it as if it were sentences on a page and the context will not be conveyed.

https://www.pcc.edu/instructional-support/accessibility/d2l/#lists
If you want to create a description list, you need to select the <source> button and type in the code for a definition list (<dl>,<dt>, <dd>)
Add a period "." at the end of each list item, this lets the screen reader know the end of the list item has been reached and pauses before going onto the next list item.