How to pass data from table to sidebar?

Question

Google Apps Script

Hello.
There is a table. It has data on it. I receive this data in an array.
Receipt Code

function getTemplateBase(){
 const sheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("data");
  let lRow = sheet.getLastRow();
  let range = sheet.getRange(2,1,lRow,4);
  let values = range.getValues();
    //Logger.log(values);
return values;
};

Now I think to transfer them to index.html with the help
let data = google.script.run.getTemplateBase();
But nothing happens. How to pass data from table to sidebar? Please help.

Answer 1

The result of executing the gs function can only be passed as an argument to the function specified in .withSuccessHandler()
You have already been told about this in one of the answers