yes it is - i can think of a few ways -

1. might be a temp dm group which is automatically setup as part of the space.

2. might be a separate relay which each post is tagged so it only identifies with that space at that time. So essentially a tag system to appear in that chat space.

3. simplest could be like the tag system but using hashtags so an option for the space host to add a hashtag that pushes all comments with that hashtag to the live chat

think any one of these systems would work.