Filtering RAR-packed releases from IRC announces in Autobrr?

I’m using Autobrr with IRC announces and Prowlarr (Torznab).

With Torznab indexers, filtering works because the indexer setup allows blocking RAR/archived content when adding the indexer.
However, with IRC announces, Autobrr still grabs releases that are RAR-packed.

There’s no .rar or similar in the release name, so regex filters don’t help. As far as I understand:

• IRC announces only provide the release name
• No file list or metadata is available at that stage

Question:

• Is there any reliable way to filter RAR-packed releases at the IRC level?
• Or is excluding known archive-heavy groups and/or enforcing this post-download the only real solution?

Curious how others handle this.