You can execute jwkset-toolbox on github Pages : https://belgianmobileid.github.io/jwkset-toolbox/

execute git clone https://github.com/belgianmobileid/jwkset-toolbox

move to jwkset-toolbox/mkjwkset

create your keys with bash mkjwkset.sh jwks.json private.jwks.json

Backup the private keys private.jwkse.json and expose the public JWKSet file jwks.json on a public HTTPS endpoint.