How to load Post Type fields with data from a remote API

I need to bring the information of a Post Type from a Remote URL that show a json file.

This information will be loaded into WP-Admin to allow user selection when Filling in custom fields on a page.

Sample of remote url(json)

{
    "id": 1,
    "nome": "Tribunal de Justi?a do Estado do Acre",
    "sigla": "TJAC",
    "unidades": [{
            "id": 2,
            "nome": "Acrelandia",
            "sigla": "AL",
            "unidades": [{
                    "id": 24,
                    "nome": "Dire??o do Foro",
                    "sigla": "ALDFO",
                    "unidades": [

                    ],
                    "tipo": "ADMINISTRATIVA"
                },
                {
                    "id": 25,
                    "nome": "Vara única",
                    "sigla": "ALVAR",
                    "unidades": [

                    ],
                    "tipo": "VARA"
                }
            ],
            "tipo": "COMARCA"
        },
        {
            "id": 3,
            "nome": "Assis Brasil",
            "sigla": "AB",
            "unidades": [{
                    "id": 26,
                    "nome": "Dire??o do Foro",
                    "sigla": "ABDFO",
                    "unidades": [

                    ],
                    "tipo": "ADMINISTRATIVA"
                },
                {
                    "id": 27,
                    "nome": "Vara única",
                    "sigla": "ABVAR",
                    "unidades": [

                    ],
                    "tipo": "VARA"
                }
            ],
            "tipo": "COMARCA"
        }
    }

My Custom Fields Created in ACF

if( function_exists('acf_add_local_field_group') ):

acf_add_local_field_group(array(
	'key' => 'group_6100ec8d1bf79',
	'title' => 'Lota??o',
	'fields' => array(
		array(
			'key' => 'field_6100f04affa8f',
			'label' => 'Nome',
			'name' => 'nome',
			'type' => 'text',
			'instructions' => 'Nome da Unidade',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => 'Nome da Unidade',
			'prepend' => '',
			'append' => '',
			'maxlength' => '',
		),
		array(
			'key' => 'field_6100f3c5ffa91',
			'label' => 'Sigla',
			'name' => 'sigla',
			'type' => 'text',
			'instructions' => 'Informar a Sigla da Unidade',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'prepend' => '',
			'append' => '',
			'maxlength' => 6,
		),
		array(
			'key' => 'field_6100f076ffa90',
			'label' => 'Comarca',
			'name' => 'comarca',
			'type' => 'taxonomy',
			'instructions' => '',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'taxonomy' => 'comarca',
			'field_type' => 'checkbox',
			'add_term' => 0,
			'save_terms' => 0,
			'load_terms' => 0,
			'return_format' => 'id',
			'multiple' => 0,
			'allow_null' => 0,
		),
		array(
			'key' => 'field_6100f421ffa92',
			'label' => 'Tipo',
			'name' => 'tipo',
			'type' => 'select',
			'instructions' => 'Selecionar Administrativo | Primeiro Grau | Segundo Grau',
			'required' => 1,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'choices' => array(
				'ad' => 'Administrativo',
				'pg' => 'Primeiro Grau',
				'sg' => 'Segundo Grau',
			),
			'default_value' => 'ad',
			'allow_null' => 0,
			'multiple' => 0,
			'ui' => 0,
			'return_format' => 'array',
			'ajax' => 0,
			'placeholder' => '',
		),
		array(
			'key' => 'field_61035043400f1',
			'label' => 'Id Parent',
			'name' => 'id_parent',
			'type' => 'text',
			'instructions' => '',
			'required' => 0,
			'conditional_logic' => 0,
			'wrapper' => array(
				'width' => '',
				'class' => '',
				'id' => '',
			),
			'default_value' => '',
			'placeholder' => '',
			'prepend' => '',
			'append' => '',
			'maxlength' => '',
		),
	),
	'location' => array(
		array(
			array(
				'param' => 'post_type',
				'operator' => '==',
				'value' => 'lotacao',
			),
		),
	),
	'menu_order' => 0,
	'position' => 'normal',
	'style' => 'default',
	'label_placement' => 'top',
	'instruction_placement' => 'label',
	'hide_on_screen' => '',
	'active' => true,
	'description' => '',
));

endif;

I need to load the api data into the ACF fields, to allow editing the Page Fields in WP Admin.

How do I implement this?