Insta is introducing another method for creators to collaborate with brands, this time through an entirely new "Creator Insights" display in their profile, which will give a snapshot of the account's performance over the last 30 days.
The basic display provides a quick overview of:
Follower growth
Accounts reached
Accounts engaged
Again, all of the metrics shown represent the last 30 days, so it's easy to get a sense of just how important and active each account has been.

As mentioned in the screenshot above, creators can choose to share this info, much like they would the same thing in Instagram's Creator Marketplace.
In fact, I suspect it's the same permissions in use, which means that if you choose to share your data in Marketplace, it may well be eligible to be shown in this display too.

It seems only brand accounts can view the quicker "Creator Insights" option, again something that is open only to a very few at this point but potentially very useful in helping more brand influencer connections occur on potential ad partnerships.
We've reached out to Instagram for more details on the roll out and expansion this display can be expected.