how can I apply echo cancelation to audiofiles on ubuntu 19.10?

it is possible to apply echo cancellation to microphones while they are recording, e.g. like this

How can I apply the same filter to audio files that already exist?

If there was a ffmpeg filter for this, it would be applied like this:

ffmpeg -i FileWithEcho.mp3 -v $module-echo-cancel FileWithoutEcho.mp3

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