Request Ticketing system - creating a view only specific people can see

So there are limitations in sharepoint online lists and permissions. There is no such thing as permission levels for each view. The only thing you could do is have supervisors listed in a person or group field for each record and create a view where it filters this field with the [Me] tag so if they are listed in the field, they see the record. 

I would recommend: 

Option 1: Creating a Nintex start event form in NAC and passing your form data from the form to the SharePoint list. Similar to what you have to do with a Microsoft Form to get the data into a list using a power automate flow (just a lot less headache since it’s Nintex!) 

From there only allow your supervisors (create a custom sharepoint group with those folks) access to the SPO list.

Or…

Option 2: if you need the initiator to see their requests in the SPO list, then add an update item permissions action after the item is created in the workflow and provision it so only the supervisor group and the initiator have access to that new item.

If the initiator visits the list, they will only ever see their own items, regardless of any view and how it’s configured. 

Or…

Option 3: If  you only want the initiator and select supervisors to see just requests sent to them, do the same thing as option 2. Pass the appropriate supervisors (based on the start event form I’m assuming if this is entered by the initiator) and the initiator to the list item instead of just the initiator when you provision the permissions. Nix the supervisor SPO group all together as described in otpion 1 if you don’t want all supervisors to have access to all list items. 

Then go with the last option I mentioned.