Yes! Click the title of your room in the top toolbar and select the "Room Details" tab. Now click on the Slack integration button. Go through the on-screen steps and you will link a Here room to a specific Slack Channel.
Now go into Slack and to the channel you just linked. Then:
@hereto add the Here bot to the channel
/hereto generate a Join Button for the room
Currently, you can link one Here room only with one Slack channel. We're working on allowing a room to be linked to multiple channels.