Woocommerce is tax rate is 0

Question

In Woocommerce, I am keeping prices the same regardless of tax rate using the filter:

add_filter('woocommerce_adjust_non_base_location_prices', '__return_false');

Now, I'd like to exclude a few countries that are exempt of tax.

This function works fine:

 add_filter( 'woocommerce_adjust_non_base_location_prices', 'custom_eu_vat_number_country_codes' );
function custom_eu_vat_number_country_codes( $boolean ) {
    // Avoiding errors on admin and on other pages
    if( is_admin() || WC()->cart->is_empty() )
        return $boolean;

    // Defined array of countries where the boolean value should be "false"
    $countries = array( 'CH','GB','GF','NO','UK');

// Remove field $countries
if ( in_array( WC()->customer->get_shipping_country(), $countries ) ) {
    $boolean = true;
}else{
    $boolean = false;
}
return $boolean;

}

I need to replace $countrie = array('CH','GB','GF','NO','UK'); by an automatic list of countries with VAT tax set as 0.000% in woocommerce parameters. Is it possible ?