https://asciidoctor.org/docs/user-manual/#attaching-to-an-ancestor-list:
You may find that you need to attach block content to a parent list item instead of the current one. In other words, you want to attach the block content to the parent list item so it becomes a sibling of the child list. To do this, you add a blank line before the list continuation.
* parent list item
** child list item
+
paragraph attached to parent list item
More complex example:
* Foo
** Aaa
** Bbb
+
Continuation of Foo
* Bar
+
Continuation of Bar
* Baz
+
Continuation of Baz
** Ccc
** Ddd
* Xyz
Notes:
A block attached to the grandparent list item:
* grandparent list item
** parent list item
*** child list item
+
paragraph attached to grandparent list item
Using blank lines to back out of the nesting may feel fragile. A more robust way to accomplish the same thing is to enclose the nested lists in an open block. That way, it’s clear where the nested list ends and the enclosing list continues:
* grandparent list item
+
--
** parent list item
*** child list item
--
+
paragraph attached to grandparent list item
a
,b
andc
are not subitems of item1
but are items of the firstblabla
paragraph. (Don't know if this answered your question) – Subterrane