Store custom tag in Flamingo

Hello,
I would like to know how to store custom tag values into Flamingo.
I tried with this code but, when I submit the form, no custom data are saved:

add_filter( 'wpcf7_posted_data', 'custom_store_tag_in_flamingo' );
function custom_store_tag_in_flamingo( $posted_data ) {
if ( isset( $posted_data['calculation'] ) ) {
$posted_data['calculation_field'] = $posted_data['calculation'];
}
return $posted_data;
}

Thank you for your help!