Multi-Year Line and Clustered Column Chart with Trend Line

Hello all,

My boss's boss is asking me to make this chart from excel in power bi:

However, I can only get power bi to show me trend lines (the dashed ones on the chart) when I use year or the full date as the x-axis. aka it will not show the trend line when using month/year as the x-axis. Googling this gives me old versions of power bi or only one year trend lines, and he wants up to 5 years, so any help would be appreciated!

I have thought about calculating the trend line myself however there isn't a place to add in a line (only error bars) when I use the month/year as my x-axis.

I have a date table that lets me choose date, year, month, ect. Here is a sample set of the data. Orange is a count from one table, green and blue are measures.

Honestly I think he would be okay with the trend lines on a seperate chart if it at least could still show it on a monthly axis. so any suggestions like that would be great too!