How to select bluetooth mic when using Pro Video recording?

Hi, I just want to record audio from my bluetooth mic when recording a video in Pro Mode and I cannot see the Mic/audio option. I can get it to work on my husband's flip phone and online everyone shows how to use it on S series phones. I am wondering if I can even do this on my A53. I do not see any option to select an external bluetooth mic for capturing the audio during a video recording.