How to add idpConnector with iControl REST API

I found a solution in the iControlRest API, I can PATCH a resource. I wasn't able to add a new connector in addition to the existing IDP connectors. But I can replace the IDP connectors for the SP with a new collection of IDP connectors, this is almost as good.

curl -sk -uUSER:PASS https://bigip-test.env/mgmt/tm/apm/aaa/saml/~Common~my_sp -H 'Content-Type: application/json'-X PATCH -d
{
    "idpConnectors": [
        {
            "name": "vps-existing-idp",
            "partition": "Common",
            "idpMatchingSource": "%{session.server.landinguri}",
            "idpMatchingValue": "*idp=existing*"
        },
        {
            "name": "vps-new-idp",
            "partition": "Common",
            "idpMatchingSource": "%{session.server.landinguri}",
            "idpMatchingValue": "*idp=new*"
        }
    ]
}