Hello,
I am having an issue and I would like some help. What I want to do is have a column in SharePoint that every time a new item is created it goes and writes on the columns named RequestNo 2021.X Like the below screenshot.

My issue is I don't want to use the ID column because It is already up to 100+ entries. But I do want every new entry from now one to have that format in that column basically the "CurrentYear.X" Where X is going to start from 1 and will keep adding 1 every time a new item is created ? Does anybody have any idea how would I go by doing this ? Do I have to do it within PowerApps ?or maybe even creating a flow just for that?
I would really appreciate any help I can get on this.