In reply to shahkavish77:
The UVM factory only concerns classes, not fields of a class.
The `uvm_field_* macros register fields of a class for automation of certain operations. But they only handle certain field types and do not support multi-dimensional arrays.
We strongly discourage the use of `uvm_field for any field because of their poor performance.
https://verificationacademy.com/cookbook/macrocostbenefit