How can I display some extra text on scale cell?

How can I display some extra text on scale cell like the screenshot below?

is there any templates or config that could help me do this?

Hello Kevin,
There is no built-in feature to do that. You need to implement a custom solution by using Gantt API and Javascript.
Here is an example that creates an additional element above the second subscale cell:
http://snippet.dhtmlx.com/10499c7e4

It works, Thanks Ramil for your help