Manage to figure it out.
thanks to @awilliams and @Kulkul in this topic How to get All Annotation Elements In Active View - section marks, elevation tags etc - #5 by Kulkul
you must not try to look for sections but have to search for views.
viewers.append(FilteredElementCollector(doc, v.Id).OfCategory(BuiltInCategory.OST_Viewers).ToElements())
thnks for your reply’s