I was able to make a hacky workaround using AppleScript. It takes the Alfred query puts it in the pasteboard open spotlight and pastes in spotlight with refinements. I made one for general, subject, and from. The query gets left in the pasteboard in case you want to refine further and you exit Spotlight. (recommend Alfred's clipboard history here...obviously 🤣)
if anyone is interested I can post it. it's ridiculously basic, but helpful. (side note: I tried bash, python and AppleScript to search emlx files. they all took forever to search when you get over 1k emails...so basically not useful for anyone)
Example:
Alferd query:
em George
Spotlight:
kind:mail George