Currently there is no attribute setting to set a fill pattern for bar charts within the attribute map data sets.
It would be helpful to be able to add pattern settings using a discrete attribute maps.
https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.5/grstatgraph/n1oq0axfb1tc1yn10kgw6dyuitk2.htm
It would be helpful to have a FillPattern as a column name.
(PS. I know you can get around this using GraphData via template + FillStyleELement)