How to use TextCollection and display as multiple-line UI

I have a requirement to add a few notes fields - as a xBO.  It seems I will have to define them as TextCollection datatypes.

These notes fields have to be displayed as multiple-line control in a facet (Accounts).

1. Any pointers on using associated TextCollection datatypes ?

2. How to add to a new facet and display as multi-line control field ?

Thanks ahead for your help !