Hi Nick,
To my knowledge, there is no direct option to get this information. However, while the keys are selected, click on the Dope-Sheet icon and there you can see the keys sorted to the objects. Then, after you got your information, you can go back to the F-Curve.
Screen capture
https://www.amazon.com/clouddrive/share/5sI8HoeCnNhnWCBVhLyBEH4oCFvzcyNO6vrTECs8xMr
In some cases this works only when CTRL is hold down, while clicking the icons, according to the manual. I never needed this, so I share it to provide a more complete tip.
Tip: Use the Tab Key to toggle between the two modes. If however a motion clip is created, this will be a triple tab for a round trip. Works as long as the Timeline window is active (Not to confuse with being visible)
I hope that helps.
All the best