This is a capability, but at present, it’s not really exposed on the frontend.
Copying below from this ticket.
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Okay, I’ve pushed an update (v1.1.8) of the plugin that provides support for “source” specific terms IDs, meaning you can associate specific terms with any channel or playlist.
To do so, you will need to set a post_meta value for tube_source_term_ids which will be a comma list of term IDs.
NOTE: there’s no “frontend” for this at this point, so you’ll need to add the postmeta via database or call to update_post_meta for the desired source.
To find the post ID of a source, go to TUBE Curator > Your Channels & Playlists and click on the source you’re working with. The post ID will be in the address bar. The process is similar for finding a term ID, but you’ll need to browse the appropriate taxonomy/ies.
So if the source post ID were 418, and you wanted videos from that source to use terms 542 and 610, you’d set up the postmeta like this…
update_post_meta( 418, ‘tube_source_term_ids’, ‘542,610’ );
Then, these terms will be applied during video creation in admin and via CRON-based imports.
Please give this a shot and update here.