'Requester' comes with a requirement.
Given A specific entity is available in Dynamics 365 CRM
When A record is created in Dynamics 365 CRM
Then An autonumber should be generated in a specific format after the record creation.
As we all know we used to write plugins for this requirement in Dynamics CRM 2011 version etc. But currently it is an out of the box feature (Introduced in 2019). It's just a new data type introduced by Microsoft.
Note: This feature is only available in the new interface ( ie: https://make.powerapps.com/)
So navigate to https://make.powerapps.com/ and choose the correct environment.
When you add a new column after choosing your solution, you would see the magic as a datatype : ). And then when a record is created ( post record creation), it populates the autonumber. Easy Peasy Lemon Squeezy!