ASM API v16 - get list of SignatureOverride

Hello, 

My client would like a scheduled report on all the signatures used as exceptions in the policy items (let's say in parameters and URL object).

I've figured that the info can be retrieved through API : https:///mgmt/tm/asm/policies//parameters/

I could have this kind of output where parameter1 has 2 signatures overrides, and parameter2 doesn't have any

{
    "maximumLength": 200,
    "stagedSinceDatetime": "2024-10-16T13:33:54Z",
    "hostNameRepresentation": "domain-name",
    "dataType": "uri",
    "createdBy": "GUI",
    "sensitiveParameter": false,
    "parameterLocation": "any",
    "valueType": "user-input",
    "kind": "tm:asm:policies:parameters:parameterstate",
    "selfLink": "https://localhost/mgmt/tm/asm/policies/gK_P0j6j8NT8wUz2pORRRQ/parameters/SZehdfNxQfRzSeE_d2V5eA?ver=16.1.5",
    "inClassification": false,
    "urlReference": {
        "link": "https://localhost/mgmt/tm/asm/policies/gK_P0j6j8NT8wUz2pORRRQ/urls/OXujEJOZ7V0nU7Mgu2-Bzg?ver=16.1.5",
        "protocol": "https",
        "name": "/random-uri/path/",
        "method": "*",
        "type": "explicit"
    },
    "checkMinValueLength": false,
    "isCookie": false,
    "mandatory": false,
    "id": "SZehdfNxQfRzSeE_d2V5eA",
    "allowEmptyValue": false,
    "checkMaxValueLength": true,
    "name": "parameter1",
    "lastUpdateMicros": 1.729085634e+15,
    "isReferenced": false,
    "isHeader": false,
    "attackSignaturesCheck": true,
    "level": "url",
    "allowRepeatedParameterName": true,
    "signatureOverrides": [{
            "signatureReference": {
                "link": "https://localhost/mgmt/tm/asm/signatures/gJ3lZomuuxyJqa2InBac1w?ver=16.1.5",
                "isUserDefined": false,
                "name": "Unix/Linux \"date\" execution attempt (Parameter)",
                "signatureId": 200003085
            },
            "enabled": false
        }, {
            "signatureReference": {
                "link": "https://localhost/mgmt/tm/asm/signatures/YqXJ-_VkhoSiQ49IuaFmUA?ver=16.1.5",
                "isUserDefined": false,
                "name": "Unix/Linux \"time\" execution attempt (Parameter)",
                "signatureId": 200003155
            },
            "enabled": false
        }
    ],
    "type": "explicit",
    "performStaging": false
}
{
            "isBase64": false,
            "maximumLength": 120,
            "stagedSinceDatetime": "2024-11-20T09:17:03Z",
            "dataType": "alpha-numeric",
            "createdBy": "GUI",
            "sensitiveParameter": false,
            "parameterLocation": "any",
            "valueType": "user-input",
            "kind": "tm:asm:policies:parameters:parameterstate",
            "selfLink": "https://localhost/mgmt/tm/asm/policies/gK_P0j6j8NT8wUz2pORRRQ/parameters/iKZNHNqAGGVo_-csIuNBwQ?ver=16.1.5",
            "inClassification": false,
            "checkMinValueLength": false,
            "isCookie": false,
            "mandatory": false,
            "metacharsOnParameterValueCheck": true,
            "id": "iKZNHNqAGGVo_-csIuNBwQ",
            "allowEmptyValue": false,
            "checkMaxValueLength": true,
            "valueMetacharOverrides": [],
            "name": "parameter2",
            "lastUpdateMicros": 1.732094223e+15,
            "isReferenced": false,
            "isHeader": false,
            "parameterEnumValues": [],
            "attackSignaturesCheck": true,
            "level": "global",
            "allowRepeatedParameterName": false,
            "signatureOverrides": [],
            "type": "explicit",
            "performStaging": true,
            "enableRegularExpression": false
}

I would like to filter the query and only have the parameters with a non-empty list of SignatureOverride. I learnt that F5 API is relying on OData and that we can borrow some of its functions. I also need to consider that SignatureOverride field is an array.

I tried this:

• $filter=signatureOverrides/any(s: s ne null)  => but the any function doesn't seem to be available

and I also tried this:

• $filter=signatureOverrides/$count ne 0    => same, the count command is not available either

how can I work with OData filter on the signatureOverrides field ?