Create a custom HTML email template

Create a custom HTML email template

Hello this is my first post so please forgive any mistakes or if this question has already been answered but in regular Zoho mail I can create email templates and there is a basic way of adding custom html into the email but I have designed a complete custom html email template that I would like to use for certain responses - the template has custom styling/layout and I would like to save this for re-use  -- is there any way I can do this?

Thanks
A.R