Rule name is available (retrieved from DB ) in as pv!integration.mappingRule.I am trying to run this rule in Node output expression rule

I have tried various options like

rule!pv!integration.mappingRule

or

rule!eval(pv!integration.mappingRule)

or

eval(rule!pv!integration.mappingRule )

None of them works . Any idea , how to make this work? Thanks in advance.