bhyve: detecting TCP console support

Hi,

Is there a way to check if the given bhyve binary supports tcp console,
such as "... -l com1,tcp=<tcpconf>"?

I've been using various workarounds to detect bhyve features for quite
some time, including parsing of the "bhyve -h" output or running "bhyve
-s 0,<dev>" and see if reports unknown device etc, but apparently none
of that works for the tcp console.

Am I missing something or is it really not possible?

Thanks,
Roman