Can you please help me add this type of expression to a project measure?

Hello,

As an example, I have a project activity with a remaining duration of 30 business days. A resource is assigned to the activity with 2 planned hours per day, so a total of 60 remaining hours (units). Given a remaining duration of 30 business days, the start month is different from the finish month.

How could I write an expression to capture the remaining hours assigned to this resource per month? I've been trying to figure this out for awhile and would like to add this measure to a dashboard chart.

Any help would be greatly appreciated!

Thank you!