Hi @ZsPapp,
Thank you for your question! At the moment, this is not possible.
The Uniqueness Rules are fundamentally set at the discipline level (excluding globally-scoped rules), meaning all collections within that discipline will adhere to those rules. This request could be added to New Feature Requests, but the current configuration was intentional and carefully considered before the implementation. If you do move forward with this and need any guidance on removing duplicates for those collections in batches, please let us know!
Thank you for reaching out!