You could create an entity to hold the selected enumeration values. For instance, create an entity called ColorSelections with on attribute of type enumeration (which uses the color enumeration). You can then create a new object in this entity for each selected value and use those objects later on.
Alternatively, if you want to use these colors, you could access them via XPath retrieval if the entity they are on is accessible from the page you want to access them from.
This app might also solve your problem: https://appstore.home.mendix.com/link/app/56183/Finaps/EnumSelector