JDK 11 added new capabilities to the diagnostic command JFR.dump, but the options are not documented. See:

https://docs.oracle.com/javacomponents/jmc-5-5/jfr-command-reference/diagnostic-command-reference.htm#GUID-6EB11926-4DAF-4B99-AF20-7FCD284EE6C1

A good place to learn about the new options are the CSR request

https://bugs.openjdk.java.net/browse/JDK-8203930

It may be worth mentioning (in the documentation) that a filename is generated if the filename parameter is omitted, and that a directory can be used as a filename and the file will be generated in that directory This is important for users who want to automate dumps in script, for example in a cronjob. For an example, see

https://stackoverflow.com/questions/55257190/trying-to-automate-java-mission-control-is-it-possible