Books API v3 List expenses not containing exchange_rate

Hello,

Thank you very much for adding exchange rate field to invoices list. We have discovered that also "list expenses" doesn't contain a field for exchange_rate. We are implementing Zoho Books api to generate charts for sales and net income total, but the results are really not accurate, if the expenses are in different currencies. While there is the possibility of picking out exchange rates from individual expenses, this would add a considerable amount of waiting time for the end user. If it is not too much trouble, would you be so kind to also add the exchange_rate field to the response of "list expenses"?

Thank you for your assistance,
Taavi