Datasources for tables in Operational Dashboard need to be configured in MAF Configuration Application today. This is the same application used to configure other role-based and mobile applications. Once you've published a new version of the app with the new datasource you'll be able to reference them in the table card.
The work queues help avoid the need to configure the app and can be done entirely through the UI. In 9.0 we enabled support for other object structures so you can surface Asset, Locations, Job Plan, etc. data.