MySql main adapter with WebService adapter in subreport

I have created a report with the main adapter and subreport adapter being a JSON webservice with no issues.  However, I've been trying to get a report to work that has a MySql adapter as the main with a WebService adapter in a table or subreport but can't for the life of me figure it out.  I've tried setting the dataset connection to "Don't use any connection or Data Source" but it doesn't seem to know what to do (required parameters for webservice are set).  I think what needs to happen is to create a new WebService adapter in code for the dataset, but can't seem to make Jaspersoft Studio happy.  Anybody have some ideas to try?

Thanks!