Encryption using AWS KMS Asymmetric key

Question

I am trying to apply client side encryption, for this using AWS KMS I created Asymmetric key. I downloaded the public key and then from the frontend (I am using react). I am using the following function to encrypt the data

function encryptMessage(message, publicKey) {
  const jsEncrypt = new JSEncrypt();
  jsEncrypt.setPublicKey(publicKey);
 
  return jsEncrypt.encrypt(message);
}

I later encode this in base64 before sending it,

The key spec is RSA_2048

And I want to use RSAES_OAEP_SHA_256 as my encryption algorithm.

Following is the backend, written in python to decrypt the message:

client = boto3.client('kms')
res = base64.b64decode(blob)
print(res)
response = client.decrypt(
    CiphertextBlob=res,
    KeyId='xxxxxxxxxxxxxxxxxxxxx',
    EncryptionAlgorithm='RSAES_OAEP_SHA_256'
)
print(response)

I am unable to send a proper encrypted message so that it can be decrypted from backend. How do I set EncryptionAlgorithm on react?