vRA7 : Display a pull-down menu to select VMware clusters

Hi,

We were using property definitions with property attributes to display a pull-down menu with VMware cluster options for the user to select in the VM request form in vCAC 5.1.

Moving to vRA 7, we are not able to use the property definitions as property attributes cannot be associated with the definitions in this version. Looking for ideas to  incorporate this in vRA 7.

Any help appreciated.

Thanks.