Hello O.,
Using SDL, a possible workaround is to use sub-diagram as:
@startuml :Ready; :next(o)| : {{ label l [ read data on: ] database db }} ; :print data> @enduml
See SDL doc. here:
If that can help,Regards.
(--------)
Not expert on UML...
Hints, as:
Then on PlantUML, even if the PIN is not implemented on Activity diagram, you can use SDL and:
@startuml :Ready; :next(o)| :<<DataStore>> Elements] :print data> @enduml
Otherwise use State diagram... see:
If that can help,Regards,Th.
OK: Your full "wanted feature" request remains.
Looking forward to trying to meet your needs...Regards.