How to Default Channel Value in Response Compose ?

Summary:

At Edit Service Request Page, business wants to default Channel Name 'Email' Value so no need to select Channel Email value while sending response. As in this screenshot , business wants to populate 'MIS Support Team' value always. Currently after selecting Channel = Email, the fields remains blank and users are selecting value.

Content (required):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):