How do I use an external microphone while recording on my camera?

I have a cannon powershot GX7 Mark 2 camera. Apparently external microphones don't connect to it.

I'm going to be recording videos of people speaking so I need good audio & video of them while they talk. However, I need a higher quality audio than the camera has. How do I get high quality sound without connecting the camera to an external microphone?

How do I use an external microphone while recording on my camera?
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