Sort by custom field in ListView (AEM Asset)

[#1]

Request for Feature Enhancement (RFE) Summary:	Sort by custom metadata field in ListView (AEM Asset)
Use-case:	User should be able to use custom data fields to sort assets in list view
Current/Experienced Behavior:	Currently only sorting of out-of-the-box data fields is supported without altering the core code of the application.
Improved/Expected Behavior:	The user should be able to sort by data fields that are added with a specific use case in mind. e.g. checking when an asset has last been used in a given context.
Environment Details (AEM version/service pack, any other specifics if applicable):	AEM 6.5 SP 9
Customer-name/Organization name:	Spar Austria
Screenshot (if applicable):
Code package (if applicable):