Filter the parameters of `get_users` call in the Widget Authors widget. See the following for `get_users` default arguments: https://codex.wordpress.org/Function_Reference/get_users
jetpack_widget_authors_params
jetpack_widget_authors_params-
action jetpack_event_logFired when we want to log an event to the Jetpack event log.
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action jetpack_site_registered_user_tokenFires when a user token is sent along with the registration data.
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filter jetpack_register_request_bodyFilters the request body for additional property addition.
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filter jetpack_signature_check_tokenAction for additional token checking.
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filter a8c_disable_full_site_editingAllow disabling Full Site Editing, even when the FSE plugin is active.
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filter jetpack_sync_whitelisted_comment_typesComment types present in this list will be synced to WordPress.com.
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action jetpack_verify_signature_errorAction for logging XMLRPC signature verification errors. This data is sensitive.
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action jetpack_connection_register_successJetpack registration Success.
Jetpack Developer Resources 