How to find a Privilege or a Role which would give access to particular task in Oracle

Summary:

Content (required): How to find a Privilege or a Role which would give access to particular task in Oracle? For example, we want to give Chart of Accounts Structure Instance access to User. For this we want to know which Privilege or Role will be suffice.

In the Simulate Navigator only tasks listed in Navigator are displayed. Want to know how any task in Oracle can be tied back to its Privilege or Role, so that we can give only that particular access to User. Please note, this question is not limited to example quoted above but for all the tasks in general in Oracle Cloud.