Select field – change selected option with code

Hi i need to change the selected option in a Select field when the form is load. I tried to use the filter ‘wpcf7_form_tag’ and for text & textarea is working but for Select fields is not.

let’s say i have a Select like this

[select my-select "one" "two" "three"]

I want to have the value “three” as default but using code. I try something like this:

function filter_wpcf7_form_tag( $scanned_tag, $replace ) {

    if($scanned_tag['name'] == 'my-select'){
        $values = 'three';
        $scanned_tag['values'][] = $values;
    }

    return $scanned_tag;
}
add_filter( 'wpcf7_form_tag', 'filter_wpcf7_form_tag', 10, 2 );

But with this code is just adding a new option so finnaly i get something like this

[select my-select "one" "two" "three" "three"]

Any idea? Thanks a lot!