Using properties obtained via custom analysis, e.g., to become a member of an automatic group

Hi.

I have an analysis (named HMCinfo) that extracts several property values from a file created and updated by a task.

One of these properties is named “HMC” and I am struggling to use the property itself. Currently, like the analysis, group membership is based on "key “HMC” of file “…/hmcinfo.text” contains “hmc-prefix”.

I would prefer the group relevance expression reads/examines something “HMCinfo:HMC” rather than duplicate what the analysis is already doing.