The web is in Japanese, but you can use google translate 
http://ys-blog.hatenablog.com/entry/2018/07/03/000447
I didn’t try it yet, but looks really interesting
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This is a great find! I hope this works with OS X because I was really disappointed with the weight editor Autodesk put out in the bonus tools which was only compiled for windows.
maya bonus tools has something similar to the weight editor, kinda works