Help with creating correct nested structure

Terraform
1

Hi, I have following map in a variable -

[{
    "a": {
        "1": [1,2]
    },
    "b": {
        "2": [1,2]
    },
    "c": {
        "3": [1,2]
    }
},
{
    "a": {
        "4": [1,2]
    },
    "b": {
        "5: [1,2]
    }
}]

I want to convert it to

{
    "a": {
        "1": [1,2]
        "4": [1,2]
    },
    "b": {
        "2": [1,2],
        "5": [1,2]
    },
    "c": {
        "3": [1,2]
    }
}

Can somebody help with how I would write nested for loops and flattening and merges here? I have tried multiple combinations and nothing seems to give me what I need.

You help here is much appreciated!