Custom Table (reporting resource) is not expanding group summary page variables like group ${name}

Hoping to put a table resource onto a groups summary page and the datasource is not expanding page variables such as ${caption} -

Select * FROM Orion.DBO.Nodes WHERE System LIKE ${caption}

--system is a custom property which matches the group name provided by the page variable ${caption}

Essentially this is keeping me from building a single report chart available for each group - instead I would need to create 100's of custom pages or 100's of individual reports.

Continuation of the same issue from this thread:  Re: Top xx Capacity Problems not expanding page variables like ${caption}