-In the documentation: https://docs.wildfly.org/28/wildscribe/subsystem/transactions/index.html#attr-jdbc-store-datasource it's stated that only datasource defined in datasources subsystem can be written to jdbc-store-datasource.
However the reality is that even non-existing datasource can be written to the attribute.
This seem to be possible even in jboss-cli.
If that is something by design, I believe that we should rephrase it in the documentation.-

Currently jdbc-store-datasource expects a JNDI name which comes with no guarantee that the given resource exists, we can instead introduce a new attribute and utilize a capability reference.