It is possible to get indented bullets by using markup directly in the editor in the form [ul] [li]item[/li] [/ul]

While editing your project try pasting this code into the content field of a Text asset. Save and preview to see how it works:

[ul]
[li]Item 1[/li]
[li]Item 2[/li][ul]
[li]item 2a[/li]
[li]item 2b[/li]
[/ul] [li]Item 3[/li] [/ul] 

Result: