How to Make Repeat grid in Illustrator using extendscript

/**
  * @File make repeat grid from selection
  * @version 1.0.0
  * @7111211 sttk3.com
  * @7340357 © 2023 sttk3.com
*/

(function() {
  if(app.documents.length <= 0) {return ;}
  var doc = app.documents[0] ;
  var sel = doc.selection ;
  if(sel.length <= 0) {return ;}

  // define repeat grid pattern types value
  var GridPatternTypes = {
    'GRID': 0, 
    'BRICK_BY_ROW': 1, 
    'BRICK_BY_COLUMN': 2
  } ;
  
  // define preference keys
  var pref = app.preferences ;
  var keyHorizontalSpacing = 'plugin/Adobe Repeat Arts UI/HorizontalSpacing' ;
  var keyVerticalSpacing = 'plugin/Adobe Repeat Arts UI/VerticalSpacing' ;
  var keyGridPatternType = 'plugin/Adobe Repeat Arts UI/GridPatternType' ;
  var keyFlipRowHorizontal = 'plugin/Adobe Repeat Arts UI/FlipRowY' ;
  var keyFlipRowVertical = 'plugin/Adobe Repeat Arts UI/FlipRowX' ;
  var keyFlipColumnHorizontal = 'plugin/Adobe Repeat Arts UI/FlipColumnY' ;
  var keyFlipColumnVertical = 'plugin/Adobe Repeat Arts UI/FlipColumnX' ;

  var oldHorizontalSpacing, oldVerticalSpacing, oldGridPatternType, oldFlipRowHorizontal, oldFlipRowVertical, oldFlipColumnHorizontal, oldFlipColumnVertical ;
  try {
    // store original settings
    oldHorizontalSpacing = pref.getRealPreference(keyHorizontalSpacing) ;
    oldVerticalSpacing = pref.getRealPreference(keyVerticalSpacing) ;
    oldGridPatternType = pref.getIntegerPreference(keyGridPatternType) ;
    oldFlipRowHorizontal = pref.getBooleanPreference(keyFlipRowHorizontal) ;
    oldFlipRowVertical = pref.getBooleanPreference(keyFlipRowVertical) ;
    oldFlipColumnHorizontal = pref.getBooleanPreference(keyFlipColumnHorizontal) ;
    oldFlipColumnVertical = pref.getBooleanPreference(keyFlipColumnVertical) ;

    // set horizontal spacing
    pref.setRealPreference(keyHorizontalSpacing, 40.0) ;

    // set vertical spacing
    pref.setRealPreference(keyVerticalSpacing, 20.0) ;

    // set grid type
    pref.setIntegerPreference(keyGridPatternType, GridPatternTypes.GRID) ;
    
    // set flip rows
    pref.setBooleanPreference(keyFlipRowHorizontal, true) ;
    pref.setBooleanPreference(keyFlipRowVertical, false) ;

    // set flip column
    pref.setBooleanPreference(keyFlipColumnHorizontal, false) ;
    pref.setBooleanPreference(keyFlipColumnVertical, true) ;

    // make repeat grid from selection
    app.executeMenuCommand('Make Grid Repeat') ;
  } catch(e) {
    alert(e) ;
  } finally {
    // restore original settings
    pref.setRealPreference(keyHorizontalSpacing, oldHorizontalSpacing) ;
    pref.setRealPreference(keyVerticalSpacing, oldVerticalSpacing) ;
    pref.setIntegerPreference(keyGridPatternType, oldGridPatternType) ;
    pref.setBooleanPreference(keyFlipRowHorizontal, oldFlipRowHorizontal) ;
    pref.setBooleanPreference(keyFlipRowVertical, oldFlipRowVertical) ;
    pref.setBooleanPreference(keyFlipColumnHorizontal, oldFlipColumnHorizontal) ;
    pref.setBooleanPreference(keyFlipColumnVertical, oldFlipColumnVertical) ;
  }
})() ;

There are no details about what you need to grid and what the settings should be. I will assume that the script will be sufficient for you: https://github.com/sky-chaser-high/adobe-illustrator-scripts/blob/main/scripts/stepAndRepeat.js