Correlation Id for Downlink Messages

I need to track the ack message for my downlink message sent to the device with some sort of my own correlation id. is this feature supported in Chirpstack? If yes, please point me to any document or link where I can find the details.

In the current implementation when you enqueue a downlink message, the response is the downlink frame-counter that will be used. In case of an ack on a confirmed downlink, you will find the same frame-counter in the ack event.