dot leaders in a numbered list

Is it impossible to add dot leaders in a numbered list?
I created a numbered list. I'd like to fill out the empty space between the text and the margin with dot leaders, indicating where my students are supposed to take notes.
I apply dot leaders by going to Tab Stops>choosing alignment right>choosing leader. The dot leaders are added everywhere I press tab.
However, in a list, pressing tab moves the level of the list one indent.
Do I have to use another way or shortcut?