Bulk Export Activities for a specific partition

Hi,

We have leads separated into multiple partitions. I'd like to get the activities data for a specific partition to calculate and generate reports with data such as "email sent", "click rate", etc.

I'm looking at the Bulk Export Activities REST API but I don't see a way to specify paritionName or paritionId of the leads I'm interested in. Technically I can get activities of all the leads and filter out the partitions I don't care for, but I'd like to check if there's a way to specify partition information to reduce the amount of data transferred and processed.

Thanks