Set WebUI Certificate via API

[Banain]

I'm looking for a way to define via API which certificate to use for the WebUI.

I managed to use the API to list installed certificates and also to add new ones (see below). But I fail to configure the freshly uploaded certificate to be used for the WebUI.

Any help is appreciated.

best regards
    Thomas

VSCode REST Plugin Sample for Certificate API:

key=super
secret=secret


### list all installed certificates
GET https://opnsense.example.com/api/trust/cert/search HTTP/1.1
Authorization: Basic {{key}}:{{secret}}

### get a specific certificate
GET https://opnsense.example.com/api/trust/cert/get/b2656c80-842c-452d-b2b5-be95bb745ee4 HTTP/1.1
Authorization: Basic {{key}}:{{secret}}

###
POST https://opnsense.example.com/api/trust/cert/add HTTP/1.1
Authorization: Basic {{key}}:{{secret}}
Content-Type: application/json

{"cert":
    {
        "action":"import",
        "descr":"testdummy3",
        "cert_type":"usr_cert",
        "private_key_location":"firewall",
        "crt_payload":"-----BEGIN CERTIFICATE-----\n[...]\n-----END CERTIFICATE-----",
        "prv_payload":"-----BEGIN PRIVATE KEY-----\n[...]\n-----END PRIVATE KEY-----",
        "csr_payload":""
    }   
}