There are options for tracking OKRs in Aha! however each has limitations.
For example, currently, a goal can have a success metric -- which is similar to a key result. However each goal can only have a single success metric. OKRs in organizations often have multiple success metrics (key results) for each objective.
Objective: Create an Awesome Customer Experience
Improve Net Promoter Score from X to Y.
Increase Repurchase Rate from X to Y.
Maintain Customer Acquisition cost under Y.
One option for improving support for OKRs would be to allow multiple success metrics per goal.