Your requirement is not available as of now but we would take this as a feature request.
However, In-order for you to send out report to users, they should be added first to your Site24x7 portal under Admin-> Users & Alerts. Once the respective users receive the request, they have to confirm and accept the invitation. You can make use of Site24x7 User role and assign the user(s) as read-only role while adding them if needed.
User Module Help Link
After adding the user(s), You can create a User Group from Admin-> User Alert Group and add the respective user(s) to the group and use Schedule report option under Admin-> Report Settings-> Scheduled reports to configure and send out to that group based on you requirement.
Schedule Report Help Link