Static file in web app

We are working on a DHIS2 web app which has an Excel template file with certain metadata information. We allow uploading of Excel files filled with data - while uploading we use the template file for validating the uploaded file. Now, the template file is part of source code, means, it is part of the compiled app.

Is there any way so that we can have the Excel template out of the compiled app, so that if any update in the template file - we can just replace the file and the app continues working without compilation?

Does the dataStore allow Excel files instead of raw JSON?