Expose TextCollection node data to Data Source

Hi,

I am currently facing issue with exposing TextCollection Data to Custom Data Source.

I am trying to create custom Datasource on Standard Object "Customer" to get Notes History While doing so I came across a issue where Textcollection node is not listing all fields.

If anyone has any idea on how to bring TextCollection from Standard BO or Custom BO to Datasource, Please advise.

Thanks in Advance