How to generate a .pfx certificate for Flutter windows MSIX lib?

 openssl genrsa -out mykeyname.key 2048

openssl req -new -key mykeyname.key -out mycsrname.csr

openssl x509 -in mycsrname.csr -out mycrtname.crt -req -signkey mykeyname.key -days 365

openssl pkcs12 -export -out CERTIFICATE.pfx -inkey mykeyname.key -in mycrtname.crt

It seems that we are developing a packaged C++ WinUI 3 apps. If it is, when we package our app, it will automatically add the runFullTrust capability