How to add custom properties to Pricegroup?

Summary: We need to add a custom property to Pricegroup to identify pricegroup of a certain type so that we can apply some business logic on top of it.

Content (required):

We need to add a custom property to Pricegroup. It can be a boolean or text value. This property should be modifyable from admin same like other properties. This property will be used at the storefront to apply certain business logic.

Version (include the version you are using, if applicable):

OCC classic

Code Snippet (add any code snippets that support your topic, if applicable):