How do I create a percentage ratio using two tables?

Hello, I'm new to the world of Power BI and I'm facing a challenge.

I'd like to analyze the complaint ratio for each customer and visualize it in a nice pie chart. I have two tables at my disposal, where each entry contains a customer number and a year in one table representing orders and complaints in the other table.

In the pie chart, I want to display the percentage of complaints relative to orders for the same time period. The lists COUNT_Complaint and COUNT_Orders have the same structure. I'd also like to be able to filter by customers and year.

I already am able to calculate the overall complaint ratio and, after filtering for individual customers, using a measure (Measure 1 = COUNTROWS('COUNT_Complaint')/COUNT_Orders*100), but I'd like to view them all simultaneously in one chart.

Thank you very much for any help!