Centrally set a system property that gets passed to all tests in a sub-directory?

[Jaikiran Pai]

Is there a way in jtreg where a particular Java system property can be 
passed to all tests that run in othervm mode and belong to a particular 
sub-directory in the test root?

Something like "othervm.test.java.opts"? What I'm trying to solve is 
instead of editing each of the 10+ test classes that have a @run 
testng/othervm or @run main/othervm to include -Dfoo=bar in the test 
definition, I would like to have a TEST.properties for that 
sub-directory which would contain this system property to be set while 
launching those tests? I have been looking the documentation 
https://openjdk.java.net/jtreg/tag-spec.html#config but couldn't find 
anything that would help in this case.


-Jaikiran