Add a line separator when replying or forwarding - Outlook style

Is there a way to add a horizontal line separator in replies & forwards, just like in Outlook client? At the moment, the replies and forwards are more Gmail style which don’t look very professional. 

If you go to Menu > Tools > Settings > Mail > Replies and Forwards you can edit the custom reply header.

The default is:

------ Original Message ------
From: {from}
To: {to}

You can change that to:

____________________________________________________________
------ Original Message ------
From: {from}
To: {to}

What the user wants is a nice HTML horizontal line below:


From: email-address
Sent: Friday, March 3, 2023 4:21 PM
To: email-address
Cc: email-address
Subject: Hello world

Not ugly dashes “------------”, how can we do it? the custom replies are plain text only.