If you are trying to just NOT HTML escape some strings, you just do {{{xx}}} instead of {{xx}}
As per:
http://mustache.github.io/mustache.5.html
So if you had a string that consisted of:
test => Q & A
Calling with:
{{ test }}
would give you:
Q & A
..but calling with:
{{{ test }}} or {{ &test }}
Would give you just:
q & a