Airpod pros as a microphone

Try to give input in your mac from airpods:

Connect your AirPods with your Mac

With your AirPods in their case, open the lid. Press and hold the setup button on the back of the case until the status light flashes white.

On your Mac, choose Apple menu > System Preferences, then click Bluetooth. Select AirPods in the Devices list, then click Connect.

To get Output from your macbook to other device Ex. Externally attached speakers

easily multiple audio outputs on Mac Try This:

Click the plus (+) button at the lower left of the Audio Devices window and select Create Multi-Output Device. Right-click (or Ctrl-click) the Multi-Output Device in the list that you just created, and select Use This Device For Sound Output.

Also Try this ->

How to Output Mac Audio to Two Audio Devices

Make sure that the headphones you want to use together are paired with your Mac over Bluetooth and/or connected via the headphone jack.

Launch the Audio MIDI Setup app, located in Applications/Utilities.

Click the plus (+) button at the lower left of the Audio Devices window and select Create Multi-Output Device.

Right-click (or Ctrl-click) the Multi-Output Device in the list that you just created, and select Use This Device For Sound Output. (You can also opt to Play Alerts and Sound Effects Through This Device from the same menu.)

Tick the sets of headphones that you want to use in the Audio Device list. (If one is a wired pair, tick Built-in Output.)

Select a Master Device in the drop-down menu.

Tick Drift Correction for the slave device in the Audio Device list.

Launch System Preferences (select  -> System Preferences... from the menu bar) and open the Sound pane.

Click the Output tab and choose the Multi-Output Device or "Aggregate device" in the list, and you should be good to go.