Heat map or scatter plot

Dear community, I am trying to create a heat map for the fields that I have in my datasource. I have fields like customername, Rate of INterest, Risk Type etc. I want to show bubbles for all customers who are below and above average. I would also would to show an average line showing which customers are falling above and below average.

I have created below 2 additional columns but they are not appearing in the table.

Average Rate of Interest = AVERAGE('Company Data'[Rate Of Interest])
Above/Below Average = IF('Company Data'[Rate Of Interest] > 'Company Data'[Average Rate of Interest], "Above Average", "Below Average")

I am very new to Power BI. Can someone guide me with the steps to achieve.