[css-multicol] Proposal: return "number" of column in :before/:after (list-item/list-style-type for column)

Please implement CSS way to return "number" of column in pseudo element
:before and :after, similar to display: list-item; list-style-type: decimal!

Optional results:

(number per column)
+---1---+---2---+---3---+
| text  | text  | ...   |
+-------+-------+-------+

(all numbers in all columns + :active the one that is relevant to
the column)
+(1)-2-3+1-(2)-3+1-2-(3)+
| text  | text  | ...   |
+-------+-------+-------+

(all numbers in first column, relevant to column-width: 100vw)
+-1-2-3-+-------+-------+
| text  | text  | ...   |
+-------+-------+-------+

(support various types, like has list-style-type)
+-A-B-C-+-------+-------+
| text  | text  | ...   |
+-------+-------+-------+


Binyamin