Option to use revert back to using first-letter avatar

Currently, if the user still using the default avatar on the creation, JIRA Agile Work board will use the username Initials as the avatar.

But, if user change the avatar even though it is from JIRA itself, it will use that avatar instead in the Work View. It will be the same when the user tries to change back the avatar to the default one.

Therefore, it would be useful if there is an option in the board configuraiton whether the user would like to use the avatar or the Initials.