Convert mhtml pages saved in Chrome to SingleFile's html format

[defcon79]

*Is your feature request related to a problem? Please describe.
I have a lot of webpages I saved in Chrome, using the default save as mhtml built into the browser. The format of this file is different from the one used by SingleFile

Describe the solution you'd like
I'd like a way for singlefile to operate on local mhtml (and also html complete perhaps) files, and do the same processing - it seems to remove a lot of extra html elements and do cleanup and the output seems a lot smaller compared to Chrome's default mhtml.

Describe alternatives you've considered (optional)
I have not found any other solutions that can do this.

Additional context (optional)
(actually this is more for singlefile-cli I suppose but am requesting here as its the main project)

[gildas-lormeau]

Maybe extracting MHTML files into HTML and saving the result with SingleFile could work. Did you try for example https://github.com/rumpeltux/python-unmht?