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$jirassimo.valueFromBundledField($!issue.fields.customfield_99999, "NAME OF THE FIELD IN BUNDLED FIELD")

Replace customfield_99999 to the actual custom field code that stores your Deviniti bundled fields and the second argument should match the name of the field in that bundled field configuration.

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Note, that both, customfield code and name of the field are CaSe SENsiTive. 

The technique described above will work if your bundled field type is "Text field". If, however, you're using "Select field" or "Checkbox field", then you need to use one of the following statements:

#set ($a = $jirassimo.valueFromBundledFieldMultiple($!issue.fields.customfield_10100, "Field name a"))
#foreach ($b in $a)
   $b
#end

or

$jirassimo.valueFromBundledFieldSingle($!issue.fields.customfield_10101, "Field name b")