Is lambda function supported in mustache template?

Summary:

Under human task activity → Notification Email → Custom Email Template , is there a way to invoke lambda function from mustache template? The documentation directs to where below example is quoted:

Template:

{{#wrapped}}{{name}} is awesome.{{/wrapped}}

Hash:

{  "name": "Willy",  "wrapped": function(text) {    return "<b>" + text + "</b>"  }}

Output:

<b>Willy is awesome.</b>

How to write the function inside data association of the notification so that the tag can be referenced?

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