Option 1 , recommended:

What we need:

Chrome extension “Stream Recorder”

Check this page to get the extension: https://www.hlsloader.com/

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Option 2, use youtube-dl:

What we need:

Chrome extension “HLS downloader” + youtube-dl

Example:

The extension can easily filter out the .m3u8 link:

https://example.com/.../index.m3u8

Then use youtube-dl with the command to download the file as mp4.

youtube-dl --all-subs -f mp4 -o "file_name.mp4" "https://link-from-hls-downloader"