Can I modify the Method Request header when sent to origin?

I have an edge request coming with method = POST, but need to convert it to GET method before sending to origin (S3 bucket). The incoming request is to open an html page but unfortunately it is a 3rd party that can't convert to GET when calling.

here is what I am trying but it doesnt seem to be working. I tried the header name to be Method or method but did not work. I dont have workers, so trying to do this on the UI.
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