Add custom Caldera Forms field types. See: https://calderaforms.com/doc/caldera_forms_get_field_types/

caldera_forms_get_field_types-copy.php

/**
<?php
/**
Add a copy of Caldera Forms default select fields with new slug "special_select"
*/
add_filter('caldera_forms_get_field_types', function($fieldtypes){

	$fieldtypes['special_select'] =   => array(
				"field"       => __( 'Special Select', 'caldera-forms' ),
				"description" => __( 'Special Select', 'caldera-forms' ),
				'icon'          => CFCORE_URL . 'assets/build/images/plus.svg',
				"file"        => CFCORE_PATH . "fields/dropdown/field.php",
				"category"    => __( 'Select', 'caldera-forms' ),
				"options"     => "single",
				"static"      => true,
				"viewer"      => array( Caldera_Forms::get_instance(), 'filter_options_calculator' ),
				"setup"       => array(
					"template" => CFCORE_PATH . "fields/dropdown/config_template.php",
					"preview"  => CFCORE_PATH . "fields/dropdown/preview.php",
					"default"  => array(),
				)
			),
	return $fieldtypes;
}
           
           
/**
 * Set options for special_select field
 */
add_filter( 'caldera_forms_render_get_field_type-special_select', function( $field ){
	$field[ 'config' ][ 'option' ] = array(
		array(
			'value' => 1,
			'label' => 'One'
		),
		array(
			'value' => 200,
			'label' => 'Two Hundred'
		),

	);

	return $field;
});

caldera_forms_get_field_types-minimal.php

<?php
/**
Basic exmaple of how to add new field type to Caldera Forms
*/
add_filter('caldera_forms_get_field_types', function($fieldtypes){

	$fieldtypes['field_name'] = array(
		"field"			=>	"Field Name",
		"file"			=>	" " //@todo path to the file for the field itself.
		"category"		=>	"basic", //@todo set category or categories
		"description" 	=> " " //@todo set description
		"setup"			=>	array(
		  //optional
		)
	);
	return $fieldtypes;
});