Please add the numbering to the Default item type
I think numbering is very useful to recognize a large number of children items at a glance.
Currently, if there is a child item under the item, it is useful to understand the child item because there is a vertical line, but if the number of child items increases, it may be confusing to which parent item the child item belongs.
At this time, numbering is quite useful, but it cannot be specified as the Default item type.
If you improve this, I think a more systematic and easy-to-understand system will be created.
