Ranking within groups

New to tensorflow. I have used ML.NET in the past.

I am trying to build a model that will rank a group of volunteers’ ability to sign up new subscribers for a service in a given day. Let’s say that for a year I hire 10 new volunteers each day (features are age, gender, education, etc … and my label is number-of-subscription-signups) . After a year I have 3650 rows of data that I want to train but use the ‘date’ as a group designation so that ranking consideration does not span across different days. How can I specify group id? or what is the proper terminology for what I’m trying to achieve (and I can do my own research)?

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I want to use ‘group id’ as it’s being used in THIS ml.net EXAMPLE) .

Thanks