I agree it would be nice. This is what I have done to help me see the hierarchy better:

div.list-item-depth-1 {
	padding-left:10px;}

div.list-item-depth-1 .list-item::before{
	content:"∙";}

div.list-item-depth-2 {
	padding-left:20px;}

div.list-item-depth-2 .list-item::before{
	content:"-";}

div.list-item-depth-3 {
	padding-left:30px;}

div.list-item-depth-3 .list-item::before{
	content:"–";}

div.list-item-depth-4 {
	padding-left:40px;}

So that's a dot, a hyphen, and an en dash. I could have added an em dash but I haven't so far.

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