Selectable street depending on the city

Question

I add the following code in in functions.php (wordpress), but it doesn't work correctly:

function change_city_to_dropdown( $fields ) {

    $city_args = wp_parse_args( array(
        'type' => 'select',
        'options' => array(
            'city1' => 'City1',
            'city2' => 'City2',
            'city3'   => 'City3',
            'city4' => 'City4',
            'city5'    => 'City5',
            'city6'  => 'City6',
        ),
        'input_class' => array(
            'wc-enhanced-select',
        )
    ), $fields['shipping']['shipping_city'] );

    $fields['shipping']['shipping_city'] = $city_args;
    $fields['billing']['billing_city'] = $city_args; // Also change for billing field

    wc_enqueue_js( "
    jQuery( ':input.wc-enhanced-select' ).filter( ':not(.enhanced)' ).each( function() {
        var select2_args = { minimumResultsForSearch: 5 };
        jQuery( this ).select2( select2_args ).addClass( 'enhanced' );
    });" );

    return $fields;

}
add_filter( 'woocommerce_checkout_fields', 'change_city_to_dropdown' );


function change_address_1_to_dropdown( $fields ) {

    $address_1_args = wp_parse_args( array(
        'type' => 'select',
        'options' => array(
            'street1' => 'Street1',
            'street2' => 'Street2',
            'street3'   => 'Street3',
            'street4' => 'Street4',
            'street5'    => 'Street5',
            'street6'  => 'Street6',    
        ),
        'input_class' => array(
            'wc-enhanced-select',
        )
    ), $fields['shipping']['shipping_address_1'] );

    $fields['shipping']['shipping_address_1'] = $address_1_args;
    $fields['billing']['billing_address_1'] = $address_1_args; // Also change for billing field

    wc_enqueue_js( "
    jQuery( ':input.wc-enhanced-select' ).filter( ':not(.enhanced)' ).each( function() {
        var select2_args = { minimumResultsForSearch: 5 };
        jQuery( this ).select2( select2_args ).addClass( 'enhanced' );
    });" );

    return $fields;

}
add_filter( 'woocommerce_checkout_fields', 'change_address_1_to_dropdown' );

I would like "street1" and "street2" to be assigned only to "city1", not to all cities. Likewise, "street3" and "street4" should be assigned to the city "city2". And, "street5" and "street6" should be assigned to the citys "city3", "city4", "city5" and "city6". Can you help me with these changes?

Thank you very much!