Maintaining the exceptions member by member in a manual way is not the most user friendly thing imho. You need to click 'too much' for adding an exception.
I found following page for adding manually an exception: https://confluence.atlassian.com/jiraportfoliocloud/configuring-teams-members-availability-828785286.html
The question now is... how can we do this via an import for example in a structured way. Is this possible? Via API?
In regards to an API there is a feature request to have the API published. You can find that request at JPOSERVER-1814. Please vote on the issue to add impact for our developers.
In regards to automating this, it may be possible with an add-on or you may be able to develop your own to perform this action.
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