How to create custom report severity

What is best way to override default uvm severity types (UVM_INFO, UVM_ERROR, UVM_WARNING, UVM_FATAL) with custom report severity types. For example, instead of displaying :

UVM_INFO @ 0: reporter [RNTST] Running test test_read_modify_write...
UVM_INFO test_lib.sv(55) @ 0: uvm_test_top [test_read_modify_write] Printing the test topology :

I would like to display something like:

MY_INFO @ 0: reporter [RNTST] Running test test_read_modify_write...
MY_INFO test_lib.sv(55) @ 0: uvm_test_top [test_read_modify_write] Printing the test topology :