$ jcmd <pid> Thread.dump_to_file -format=json threads.json     (28-beta+21-ea)
<pid>:
Created <tmp>/threads.json

# the scope "orders" and its child scope in threads.json (stack frames, timestamps and ids trimmed or masked)
"container": "orders\/jdk.internal.misc.ThreadFlock$ThreadContainerImpl@<hash>",
"parent": "<root>",
"owner": <n>,
"tid": <n>,
"virtual": true,
"state": "TIMED_WAITING",
"ThreadDump.lambda$main$1(ThreadDump.java:12)",
"tid": <n>,
"virtual": true,
"state": "WAITING",
"ThreadDump.lambda$main$2(ThreadDump.java:16)",
"container": "inventory\/jdk.internal.misc.ThreadFlock$ThreadContainerImpl@<hash>",
"parent": "orders\/jdk.internal.misc.ThreadFlock$ThreadContainerImpl@<hash>",
"owner": <n>,
"tid": <n>,
"virtual": true,
"state": "TIMED_WAITING",
"ThreadDump.lambda$main$4(ThreadDump.java:15)",