Developed a substitution plan and digital class register app for Nextcloud to centralize everything in Nextcloud

I am in a school-based training as an information technology assistant at a vocational college in North Rhine-Westphalia in Germany. My vocational college would like to switch from an analogue to a digital class register in the near future - since we already have the substitution plan via Untis, and this company also offers this, the idea is to use it soon. I ask myself the question whether there were already considerations for a substitution plan and class book app.