Callback or Event on BulkAction table row selected one checkbox.

Hi everyone, I have two questions. 1. I want to use the Summaries on my table or I will create one custom Widget for sums like that. My aim is to get selected rows on a callback when a user clicked on that row. I know I can get all of the selected ones on action on Bulk Action. But I need "selectRow" or "deselectRow" event when a row is selected exactly. Is this possible? 2. I want to load table with "some" selected rows on bulk action on first load after mount. Is this possible? Thanks.