Using Dynamic Data Masking in SQL Server set Custom String

I need to mask the data in the following table. For example, I need to mask the first_name of the user Roberto to something like NAME>, So the end result should look like NAME1 Is this possible in SQL Server? My SQL Server details below. I have tried these methods from the documentation but still no luck [from documentation](https://learn.microsoft.com/en-us/sql/relational-databases/security/dynamic-data-masking?view=sql-server-ver15#defining-a-dynamic-data-mask)