Go to, Configurations --> Others --> Super Metrics.
Click on ADD and then give any name to the Super Metrics. Click NEXT.
In Object Types, dropdown and select 'Virtual Machine'. Click NEXT.
In Formula Section, enabled the 'Unformatted' option and type the formula manually in below format. ${this, metric=CustomProperty|nameOfProperty}
Click on Validate and Preview the result.
Note: With this, you can see custom property when you configure the super metric. Because custom property created are not automatically visible in super metrics so then need to manually set with above workaround