Is there anyway to mute the internal microphones so no sound is recorded?

DJI needs to  switch on the Mute in firmware, or buy a Boya adapter do not plug in, but remember to remove,  reasons DJI does not do one is because people will forget to remove the Mute.  or simply in post Mute  the audio

Hi, BrianKushner. Thank you for reaching out. It is not possible, we recommend removing the sound from post-production. We'll also take it as a suggestion of yours and forward it to our relevant team for evaluation. Thank you for your kind understanding.