How can I assign ZohoMail as Email-Program in Google Chrome Browser?

How can I assign ZohoMail as Email-Program in Google Chrome Browser?

Hello all, 
I am using Zoho Mail for a long time and now as a part of Zoho CRM Plus. It's great. I want to make use of ZohoMail as often as possible, but Google Chrome always opens Outlook whenever I click an email-field inside ZohoCRM. How is it possible to configure CRM, ZohoMail and Google Chrome in a way, that I can finally can get rid of this problem and use it as one app?  
Best Regards
Rüdiger