It should be easy enough to create one. There is a list view in the Data-Admin-Operator-ID class called OperatorList ALL that contains the data you need. You can do a private checkout and enable the Export to Excel option, or use it as the basis for your own Report Definition.
Did you try using the list views in the Operator ID class? I bet there are quite a few which would give you the operator lists with accessgroup. But remember that this would be the primary access group which would be returned. If you are looking to see all the accessgroups assigned to the user then you need to configure one of these reports to add the additional accessgroups in the display fields option.
if you just need the active access group of a operator then you can query DAT-ADMIN-OPERATOR-ID class or leverage existing list views. If you are looking for more details on additional access groups and roles etc as you mentioned their level of access. Instead of querying Operator class You can try browsing index classes on operator i.e. PR_INDEX_OPERATOR_* tables where you can get additional access groups , roles and their work groups etc..
There is a list view called "BrowseOperators". If you are in the designer studio, just search for this listview and you can get to it. Run, export the results to excel.
I guess you have access to Designer Studio. PegaRULES:SysAdm4 role (as an example) is sufficient since Read/Write/Delete rules settings on Data-Admin-Operator-ID class are enabled upto Production environment for this role. If you have a custom role, adjust the settings to allow your access to rules of OperatorID class.
If you want to navigate to Operator ID class, Select "App" in the Explorer Panel options and expand List View rules under Reports category as shown.