AWS's advice, btw, to is grab the jwk once, convert it to PEM and then upload the PEM with your lambda, instead of converting in the lambda, which seems like good advice, although one wonders why they don't just give you the damn PEM?
Maybe some verification tools prefer the jwk and some the pem, fiik.
FWIW the "e" key in your jwk is the exponent and the "n" key is the modulus, there are algorithms for converting that to the full key I think. I believe they're both base64 encoded.
Something like this might work
https://superdry.apphb.com/tools/onl...-key-converter
just paste you exponent and module in the XML input.