Import/Associate "Task Description" field from MS Project

Import/Associate "Task Description" field from MS Project

Hello,
Our workflow is to create a project in MS Project (much faster than creating every individual task in Zoho), and import it to a Zoho project.
When I import the project, I have very few issues except I'm not given the option to associate my custom field "Task Descriptions' to the Zoho "Task Descriptions" field.
(See attached image)

How can I accomplish this without opening every single task and copy+pasting the descriptions?

Thanks