Customizing RDM Notifications

Reported for version 9

How to create an email template that displays a value from one of the columns of a reference table with multiple attributes, and is it possible to define a specific place in the email to display the values?

The Customer ID should be displayed in the columns section as an output of:

{item|$item.columnLabel$: <i>$item.value$</i><br/>}

Note that you could also use $item.oldValue$ to compare the old value to the new one.
Unfortunately, it is not possible to fetch the value of one specific column to be displayed in a specific place in the email template.