Srdjan Martin has an announcement:
SQL native Scalar user-defined functions (UDFs) in Microsoft Fabric Warehouse and SQL analytics endpoint are now in preview.
A scalar UDF is a custom code implemented in T-SQL that accepts parameters, performs an action such as complex calculation, and returns a result of that action as a single value.
I wonder if the same advice for SQL Server will apply to these: don’t use them because they are performance sinks. Knowing that these are scalar functions, I’d be inclined to do some considerable performance testing before rolling them out.