So are you trying to use this in Client Relevance (like in a Fixlet or Task), or in Session Relevance (from Web Reports, SOAP/REST API, Console Dashboard)?
Property Results are not available in Client Relevance; you’d have to copy your original relevance and make a new statement based on it.
In Session Relevance, you’d need to use the ‘bes property results’ inspector family, see https://developer.bigfix.com.
I don’ have a console handy, but I think it’s along the lines of
(values of it, names of computers of it) of results of bes properties whose (name of it = "Power HA")