It does indeed support this feature.
To select the output port, where you connect the packet sniffer, use the command
where <port> is the port you want to use for the output.
To select the ports you want to monitor, use the command
interface ethernet < monitor-list > monitor
where: < monitor-list > includes port numbers and static trunk names such as a4, c7, b5-b8, and trk1.
To turn either of these off, prefix the command with ‘no‘.
These are also available through the web interface, but the CLI is an easy way, and the way that I configure any of these switches.
Hope this helps.