Bottom elevation of the dropheads/floorslab

Hi everybody!
I am new here, just started learning Dynamo, so I hope somebody will help me.
So I am solving one simple problem - by our country codes we need to display dropheads (and basically all elements overhead) in the floor plans (with dot-dot-dash line). On the smaller projects I did basically with underlay and linework. But right now I am working on a much bigger project and problem is that structural model is linked - so underlay doesn’t work - and lineworking thousands of floors will take forever.
So I created a simple graph - basically it draws all the floors on the level to the selected view as a detail line - works perfectly, I need to solve one last thing - how to write a clear height under the drophead?

Here is an example of what final product should look like.