Hi @RKG ,
I will recommend you to use Power Automate. Power Automate allows you to connect two or more applications (whether from Office 365 or third parties) and perform actions that automate the most routine business processes. Some of the functions of this tool are to move data between systems, send reminders about tasks, support data from any API, automate tasks from a local device.
I have found some nice article about populating a Word document. You can make a reference
https://www.strategy365.co.uk/populating-word-document-with-microsoft-power-automate/
https://www.c-sharpcorner.com/article/how-to-fill-sharepoint-metadata-in-word-document-template-using-quick-parts-and/
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