Is it possible with Bicep/Json to concat arrays of objects inside arrays of objects?

Question

I have this JSON structure with parameters I use to deploy an Azure vWAN with vHubs and landingzones (VNets) in multiple regions with Azure Bicep:

    {
    "regions": [
        {
            "location": "westeurope",
            "hubAddressPrefix": "10.70.0.0/16",          
            "landingZones": [
                {
                    "name": "production",
                    "addressPrefix": "10.71.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.71.1.0/24"
                        }
                    ]
                },
                {
                    "name": "acceptance",
                    "addressPrefix": "10.77.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.77.1.0/24"
                        }
                    ]
                },
                {
                    "name": "test",
                    "addressPrefix": "10.78.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.78.1.0/24"
                        }
                    ]
                }
            ]
        },
        {
            "location": "southcentralus",
            "hubAddressPrefix": "10.90.0.0/16",          
            "landingZones": [
                {
                    "name": "production",
                    "addressPrefix": "10.91.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.91.1.0/24"
                        }
                    ]
                },
                {
                    "name": "acceptance",
                    "addressPrefix": "10.97.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.97.1.0/24"
                        }
                    ]
                },
                {
                    "name": "test",
                    "addressPrefix": "10.98.0.0/16",
                    "subnets": [
                        {
                          "name": "general",
                          "addressSpace": "10.98.1.0/24"
                        }
                    ]
                }
            ]
        }
    ]
}

I need to concat the "landingZones" arrays in both regions. The result must be 1 array with the objects of all "landingZones" arrays, like so:

"landingZones": [
    {
        "name": "production",
        "addressPrefix": "10.71.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.71.1.0/24"
            }
        ]
    },
    {
        "name": "acceptance",
        "addressPrefix": "10.77.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.77.1.0/24"
            }
        ]
    },
    {
        "name": "test",
        "addressPrefix": "10.78.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.78.1.0/24"
            }
        ]
    },
    {
        "name": "production",
        "addressPrefix": "10.91.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.91.1.0/24"
            }
        ]
    },
    {
        "name": "acceptance",
        "addressPrefix": "10.97.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.97.1.0/24"
            }
        ]
    },
    {
        "name": "test",
        "addressPrefix": "10.98.0.0/16",
        "subnets": [
            {
                "name": "general",
                "addressSpace": "10.98.1.0/24"
            }
        ]
    }
]

With the above concatenation I can deploy routes in the vWAN Hub routing table to route all traffic through an NVA.

I already tried to use multiple iterations (Loop-in-a-loop) but that ends up in only deploying routes for the landingzones that are processed in the last loop (overwriting the routes processed in earlier loops).