Here's an example of getting an adjacent cell value, be it dynamic (created using a function or a flat value)
function getAdjacentValue() {
var range = SpreadsheetApp.getActiveRange();
var col = range.getColumn();
var row = range.getRow();
var range2 = SpreadsheetApp.getActiveSheet().getRange(row,col+1);
return range2.getValue();
}
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