Firebase/JWT php plugin to create ECDH-ES+A256KW token

i use this site to create JWT token and now i want to create that in php code with firebase plugin but i have to change algoritm & encrypt like the photo below + with a specific public key:

enter image description here

the simple code for creating JWT in this plugin is like this:

$secretKey = 'key';
$payload = [
  'iss' => 'http://test.com', // refer site
  'iat' => time(), //  token generate
  'nbf' => time()+30, /// token usable after 
  'exp' => time()+36000, /// token expire
  $data = ['email' => $email] 
];
$jsonWebToken = JWT::encode($payload,$secretKey,'HS256');

so how i must change the code to generate that key?!