Nested Repeating Groups and Intersecting Cells

Hi All, I am new to Bubble and have come unstuck on a particular aspect of my project - any help with this would be greatly appreciated!

I am trying to replicate a spread sheet we currently use for scheduling courses, This has date columns and a row for each instructor. In the intersecting cells the user will enter basic info eg. course type and venue.

In Bubble I am using Repeating Groups - one set as a column displaying each instructors name and one set as a row for each date. Instructor names are pulled from the Data Type “Instructors” and the dates are generated automatically. The two RGs are currently nested with RG Instructors Names nested under RG Date Generator. This aspect is working and displaying correctly on preview.

The bit I am banging my head against is referencing both the current cells Instructor and the current cells date in a Search For expression in a text field. This is the intersecting cell which will display data from the Data Type Courses. I have spent hours and hours on this with no success but I think this may be down to my lack of experience/knowledge and to be honest, I am not even sure that what I am trying to achieve is possible!

Thanks in advance,

Neil