Can we use custom JSON format to generate forms?

[avifox]

I am using the angular ngx-formly library to generate dynamic forms. I am following this example: https://stackblitz.com/angular/bxpovqrjjql?file=src%2Fapp%2Fapp.component.ts

The code makes use of a JSON format as below:

[
{
"key": "firstName",
"type": "input",
"templateOptions": {
"label": "First Name"
}
},
{
"key": "lastName",
"type": "input",
"templateOptions": {
"label": "Last Name"
}
},
{
"key": "mac",
"type": "input",
"templateOptions": {
"label": "Mac Address",
"pattern": "([0-9A-F]{2}[:-]){5}([0-9A-F]{2})"
}
},
{
"key": "color",
"type": "input",
"templateOptions": {
"label": "Color Preference (try this out)"
}
},
{
"key": "reason",
"type": "textarea",
"templateOptions": {
"label": "Why?"
},
"expressionProperties": {
"templateOptions.label": "'Why did you choose ' + model.color + '?'"
},
"hideExpression": "!model.color"
}
]
I need to use a different type of JSON as per below:

    "fields": [
        {
            "index": 0,
            "label": "First Name",
            "type": "text",
            "placeholder": "Enter First Name",
            "employeeMapping": {
                "section": "Employee",
                "key": "firstName"
            }
        }
    ]

Is this feasible with formly or do we need to use the standard JSON format provided?

[aitboudad]

see #1982 (comment)