Create an Audit for all sites associated to a Hub Site

There is a specific Hub Site that we created for documents that we have migrated from a legacy system to be reviewed by staff.  There are over 20 sites associated with the Hub Site. 

We pull Audit Searches of activity for use with a PowerBI that we use to help determine activity and volume of usage. 

I was hoping that there is an easier way to pull the Audits for all of the sites associated with the Hub Site rather than having to pull an audit log for each and every single site.