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Regarding tool to design word like document:
Essential DocIO is a non-UI component that provides a full-fledged document instance model similar to the Microsoft Office COM libraries to iterate with the document elements explicitly and perform necessary manipulation.
Essential DocIO is a native .NET Word library that is used by developers to create, read, write, and convert the Word documents.Regarding has merge fields option:
You can create a Word document template using Microsoft Word application or by adding merge fields in the Word document programmatically.
Please refer the below UG documentation link to know more about working with TextFormField in Word document using DocIO:https://help.syncfusion.com/file-formats/docio/working-with-mail-mergeKindly provide us the following details
1.Could you please confirm us whether you need to design Word document template with the help of UI component
2.Kindly, provide us whether you are designing the Word document in Windows Forms ot other platforms?
3.Could you please share us the simple template.Based on the above details, we will check the feasibility to achieve your end requirement and provide you the proper solution at the earliest.
Please let us know if you have any other quires.