I want to achieve a bookmarking behavior like the example below using a custom script.

Selecting all table cells from the table:

Select a table cell:

Selecting table column from bottom to top:

CodePudding user response：

This is what worked for me:

function myFunction() {
  var doc = DocumentApp.getActiveDocument(); 
  var selection = doc.getSelection().getRangeElements();
  var pos = selection[0].getElement();
  doc.addBookmark(doc.newPosition(pos,0));
}

Screenshots:

Full table

Column only

Single table cell