What you would need to do:
- In the inline list source table, add as many user specific columns as you need to hold the values you want to use
- Then create a single relation that joins the two tables (from the details source table to the inline list source table)
- Finally, modify the action on your inline list so that it is a custom action with two steps:
- the first step sets the values of the user specific columns in the inline list source table via the single relation, using values from your details source sheet
- the second step does a View Details
At that point, you should have the values that you need available to be used.