Need to indent items in UI elements that don't support it, like the Checkbox group or Radio Button Group?
- Duplicate your UI element
- Remove lines that need to be indented from the first one
- Remove all lines except indented ones from the second one
- Overlay second UI element on the first one
- Select both UI elements (easest to do with CTRL \ ⌘ + A)
- Group the UI elements together from the menu (or press CTRL \ ⌘ + G)

You can even transform the group to a component. This will make it easier to use from the UI library or search.