Not reliably, but here is the best substitute that I am aware of.
Click on the icon at the top left, select Email Settings.
Search for Personal level indicators and turn them on.
Save changes.
You'll now have indicators of which emails were sent to you personally, and a stronger indicator of emails sent only to you. When people respond to you they tend to reply to you, so it tends to work out reasonably well.
That's pretty useful, thanks! It seems like they ought to be able to directly mark messages which are reply to one of my messages via message-ids, but this does catch the majority of them.
Click on the icon at the top left, select Email Settings.
Search for Personal level indicators and turn them on.
Save changes.
You'll now have indicators of which emails were sent to you personally, and a stronger indicator of emails sent only to you. When people respond to you they tend to reply to you, so it tends to work out reasonably well.