how to get attrs ?

Version

Tell us which versions you are using:

• tcomb-form-native (newest)
• react-native v0.59.9

Expected behaviour

i need to get the attribute that in the fields. how to get it?

i made this :

var options = {
    fields: {
        name: {
            label: 'Name',
            stylesheet : textInput,
            attrs: {
                idForm: 12,
            }
        },
}

how to get attrs the idForm? because when i call this.refs.form.getValue(); just send the value