I’m looking for ways to modify an existing PowerPoint presentation using JavaScript (in Node) and replace certain placeholders put in the presentation with data fetched from elsewhere. The flow I am looking for is for the user to upload a templated presentation (has placeholder tags wherever required and with appropriate names for each tag) and then return to them a modified version with every placeholder removed and the relevant data added. So the uploaded file would have slides that kinda look like this:

The closest thing I found that fulfills this is docxtemplater, however, the module that achieves the functionality I want is paid and I am looking for something free.