Convert a dictionary with dot and array symbols in keys to proper dictionary format

Question

I am new to python and I need to write a generic code that do the following for me:

Input Dictionary :

input_dict = {
    "key1.key2.key3": 1,
    "key4.key5": True,
    "key6": 2,
    "key7[arr_key1]": 5,
    "key7[arr_key2.arr_subkey1]": "hello",
}

Desired output :

{
    "key1": {
        "key2": {
            "key3": 1
        }
    },
    "key4": {
        "key5": True
    },
    "key6": 2,
    "key7": [
        {
            "arr_key1": 5,
            "arr_key2": {
                "arr_subkey1": "hello"
            }
        }
    ]
}

Basically, it should create a nested dictionary if dot notation is found in key and if '[' is found then convert it to array first the continue with conversion of dot notation.

I have written this piece of code that works fine for dot notation but I am not figure out how to update it for array objects.

res = {}
for key, value in input_dict.items():
    if "." in key:
        temp = str(key).split(".")
        last = temp[len(temp) - 1]
        current_level = res
        for part in temp:
            if part != last:
                if part not in res:
                    current_level[part] = {}
            else:
                current_level[part] = value
            current_level = current_level[part]
    else:
        res[key] = value
print(res)

Any help is highly appreciated. Thanks in advance.