Available in Mobile WMS for Dynamics AX/365FO version 3.15.3 or newer.
If you want to display the on-hand inventory you can use the built-in expression.
The example below combines two cell modifications to have a prefix "On-Hand: " and the other is the inventory value.
Important to note that the expression does NOT work if you want to combine prefix or postfix value together with the on-hand value. This have to be split up into two cell modifications as the example here illustrates.