Custom preview text/preheader for changelog emails

I want to be able to customize the preview text (preheader) for changelog emails separately from the changelog title. Currently, when I send changelog emails, the subject line uses the changelog title, but the preview text that appears in email inboxes (Gmail, Outlook, etc.) also duplicates this title because it pulls from the first few lines of the email body. This creates a redundant experience for recipients. I would like a separate field in the changelog email settings where I can write custom preview text that would appear in email clients' preview panes, independent of the subject line. This would allow me to provide additional context or a compelling description without repeating the title twice. This is important because it would improve the email recipient experience, make our changelog announcements more professional, and give us better control over how our updates appear in crowded inboxes.