If you want to get all selected values of a subgrid you can try with this sample.
var gridContext = formContext.getControl("AttendeesSubgrid");
var allSelectedRows = gridContext.getGrid().getSelectedRows();
var attendeeList = [];
allSelectedRows.forEach(GetSelectedRecord);
function GetSelectedRecord(item) {
var rowData = item._entityId;
var attendiee = rowData.guid;
attendeeList.push(attendiee);
}
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