Draw a straight line from a guide coefficient

Hi,

I am on a PowerBI project and I have a table with a number of hours spent each day for a type of task. In my dashboard I trace the number of hours spent according to the month for task "A", as well as the cumulative per month: for example in the same figure for month 5, I have the number of hours spent in May as well as the cumulative from January to May of the number of hours spent on task "A".

I would like to add to my figure a cumulative theoretical annual curve based on a coefficient: for example, I have a table with in column 1 the task and in column 2 the estimated number of hours per month.

I can't do this trace. How to do this?

Thank you.