Manually provide 814.ffmpeg.js's path

[avi12]

Is your feature request related to a problem? Please describe.
I cannot load the module in a Chrome extension scaffolded by Plasmo
The reason is that when FFmpeg loads up, it looks for 814.ffmpeg.js in the same directory as ffmpeg.js, whereas Plasmo, which uses Parcel under the hood, renames the file to include a hash, e.g. 814.ffmpeg.d7h8ng.js

Describe the solution you'd like
Allow manually providing a path to 814.ffmpeg.js

Describe alternatives you've considered
The only alternative is to create an extension without using Plasmo