How can I find out who removed a role from a specific user in Oracle Fusion Cloud?

How can I find out who removed a role from a specific user in Oracle Fusion Cloud?

For example, user "A" was assigned the "BI Authors" role during user creation. Later, this role was removed from user "A" by someone. I would like to know if there is a way to track such changes in Oracle Fusion Cloud — specifically, who made the change and when.