Convert an ACF Field Group from PHP to ACF-JSON

acf-field-group-php-to-json.php

<?php
// Get all the local field groups and loop through them for processing.
$field_groups = acf_get_local_field_groups();
foreach ( $field_groups as $group ) {

	// If the field group has fields, load them into the 'fields' key. 
	if ( acf_have_local_fields( $group['key'] ) ) {
		$group['fields'] = acf_get_local_fields( $group['key'] );
	}

	// Write the group's JSON file. 
	acf_write_json_field_group( $group );
}

@daniloparrajr, I suspect you may need to loop through fields within the field group and if they have sub fields, assign those to the field's sub_fields key.

1. Have you tried inspecting the $group['fields'] value after it is assigned to see if acf_get_local_fields() gets sub fields as well?
2. Have you dug into ACF at all to see how ACF handles local field groups for clues?

If you find a solution, suggest an adjustment so we can update the snippet.