Have you considered a simpler option of using PowerApps? There's an interesting blog that sounds aligned to your goal here: https://www.matthewdevaney.com/power-apps-export-to-excel-as-a-csv-file/
Azure itself is focussed on PaaS components and hosting your web app. You could code a Web App to solicit user input and write to an excel document... but it would require coding experience and then you'd simply use Azure for hosting your app.