json - Post an array of objects from an HTML form using Flask?

I want to generate this JSON object containing an array of objects from form inputs:

{
"network":[
    {"layer_type": "conv2d", "num_filters": 16, "kernel_size": 2, "padding": "valid", "stride": 2},
    {"layer_type": "max_pool2d", "num_filters": 16, "kernel_size": 2, "padding": "valid", "stride": 2},
    {"layer_type": "conv2d", "num_filters": 32, "kernel_size": 3, "padding": "valid", "stride": 2}       
  ]
}

Is there a way I can do this using Flask?

Update

Here's what the form looks like:

As for the snippet of html code dynamically generated:

Edit: Since this question is being marked as duplicate I'm going to add more info. I want to achieve something like this in this question but using Flask:

{"students" => [
  {
    "first" => "foo",
     "last" => "bar",

      "age" => "21"
  },
  {
    "first" => "baz",
     "last" => "qux",
      "age" => "19"
  }
]}

It does work with Ruby according to the accepted answer there by having this kind of form:

But I want to know how to do it using Flask.