Hey guys, I have a question about some functionality that I'm sure is possible but I can't figure out. 

I have created a bar chart showing the revenue generated by all deals across all months in 2023. It currently looks like this:

We currently have monthly sales targets that change periodically throughout the year. These are not dynamic targets - they are set statically on a per-month basis. Specifically: 

Jan-May: £6000

June-Aug: £15000

Sep-Dec: £18000.

What I want to do is create a per-cell threshold which displays the target for each month. I have created a simple table with dates and these target figures, but I can't figure out a way of accurately displaying the thresholds in the chart. Can anybody help with this?