acf_color_swatches

function pg_override_color_picker_swatches() {
    if ( is_page( [ CREATE_BANNER_PAGE, EDIT_BANNER_PAGE ] ) ) {
        $colors = [
            '#000000',
            '#ffffff',
            '#DD3333', // red
            '#DD9933', // orange
            // '#EEEE22', // yellow
            // '#81D742', // green
            // '#1E73BE', // blue
            // '#8224E3', // purple
        ];
        $primary_color   = false;
        $secondary_color = false;

        if ( isset( $_GET[ 'id' ] ) ) {
            $post_id         = $_GET[ 'id' ];
            $fields          = get_field_objects( $post_id );
            $primary_color   = ! empty( $fields[ 'pg_primary_color' ][ 'value' ] ) ? $fields[ 'pg_primary_color' ][ 'value' ] : $primary_color;
            $secondary_color = ! empty( $fields[ 'pg_secondary_color' ][ 'value' ] ) ? $fields[ 'pg_secondary_color' ][ 'value' ] : $secondary_color;
        }
        if ( false != $secondary_color ) {
            array_unshift( $colors, $secondary_color );
            array_pop( $colors );
        }
        if ( false != $primary_color ) {
            array_unshift( $colors, $primary_color );
            array_pop( $colors );
        }
        $colors = "'" . implode("','", $colors ) . "'";

        // @TODO: maybe don't apply to primary/secondary color
    ?>
    <script type="text/javascript">
        (function($) {
            acf.add_filter('color_picker_args', function( args, $field ) {
                args.palettes = [ <?php echo $colors; ?> ];

                return args;
            });
        })(jQuery);
    </script>
    <?php
    }
}
add_action( 'acf/input/admin_footer', 'pg_override_color_picker_swatches' );