Use a Word file with HTML tags as the input for the email body which will preserve the formatting in UiPath:
Read Word File:
Utilize the “Read Text File” or “Read Word File” activity to read the content of your Word file into a variable.
Send Email:
Choose an email activity (e.g., “Send Outlook Mail Message”).
Set the variable containing Word file content as the body of the email.
Ensure the email activity supports HTML formatting, and set the IsBodyHtml property to True.
For ref: How to insert HTML code to UIpath SMTP send mail body
Hope this helps:)