Adding Numeric Data Labels to a Gantt Chart

Hi MMurphy 

You may not be able to do this by adjusting the format.

However, I can provide other solutions for your reference:

Here's some dummy data

“Project schedule”

Create a new column. Used to describe values represented by different shades of color.

Description = 
"Per:" & 'Project schedule'[Per] & " " &  "Dur:" & 'Project schedule'[Dur] 

Create a visual. Put the Description column in Resource and enable Data Labels.

Here is the result.

I hope you found this helpful.

Regards,

Nono Chen

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