When I access an area120 Table from apps script, I can see the description of all fields in a table using code like this:
var tableID = "TABLE ID"; // ID for the table
var tableName = "tables/" + tableID;
var response = Area120Tables.Tables.get(tableName);
Logger.log(JSON.stringify(response));
The output will include data for summary columns from the table, which might contain something like "16 of 17".
However, when I try to access the content of the summary column, using eg