在Ansible中以字符串形式从列表中获取项目

我正在尝试通过Ansible从Keycloak安装中获取RSA密钥。我从Keycloak API返回的变量是：

"msg": {
    "cache_control": "no-cache",
    "changed": false,
    "connection": "close",
    "content_length": "2011",
    "content_type": "application/json",
    "cookies": {},
    "cookies_string": "",
    "date": "Sun, 05 Jul 2020 13:32:42 GMT",
    "elapsed": 0,
    "failed": false,
    "json": {
        "active": {
            "AES": "redactedredactedredacted-redacted-redacted",
            "HS256": "redactedredactedredacted-redacted-redacted",
            "RS256": "redactedredactedredacted-redacted-redacted"
        },
        "keys": [
            {
                "algorithm": "HS256",
                "kid": "redactedredactedredacted-redacted-redacted",
                "providerId": "redactedredactedredacted-redacted-redacted",
                "providerPriority": 100,
                "status": "ACTIVE",
                "type": "OCT"
            },
            {
                "algorithm": "AES",
                "kid": "redactedredactedredacted-redacted-redacted",
                "providerId": "redactedredactedredacted-redacted-redacted",
                "providerPriority": 100,
                "status": "ACTIVE",
                "type": "OCT"
            },
            {
                "algorithm": "RS256",
                "certificate": "redactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redactedredactedredactedredacted-redacted-redacted=",
                "kid": "redactedredactedredacted-redacted-redacted",
                "providerId": "redactedredactedredacted-redacted-redacted",
                "providerPriority": 100,
                "publicKey": "thisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEY",
                "status": "ACTIVE",
                "type": "RSA"
            }
        ]
    },
    "msg": "OK (2011 bytes)",
    "redirected": false,
    "status": 200,
    "strict_transport_security": "max-age=31536000; includeSubDomains",
    "url": "http://localhost:8080/auth/admin/realms/master/keys",
    "x_content_type_options": "nosniff",
    "x_frame_options": "SAMEORIGIN",
    "x_xss_protection": "1; mode=block"
}

}

...我希望publicKey生成一个JWK。可以说我正在使用kc_keysAPI响应对象中的变量。

"{{ kc_keys.json['keys'] | map(attribute='publicKey') }}"

...返回"msg": "<generator object do_map at 0x7f9c6b3014d0>"。

好的，这是一个对象。我可以将其转换为"{{ kc_keys.json['keys'] | map(attribute='publicKey') | list }}"返回的列表...

"msg": "[AnsibleUndefined, AnsibleUndefined, 'thisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEYthisISApublicKEY']"

从这里开始，文档尚不清楚我如何将我自己提取thisISApublicKEY...为字符串。如何从上面的最后一步中获取字符串中的列表中的最后一个元素？