Gist code for Electric Tables V0.2.

bookmarklet.js

// Convert this JS code into a bookmarklet using a tool like: http://js.do/blog/bookmarklets/
// Be sure to add your own macro_url and spreadsheet_url

var macro_url = "THIS IS YOUR MACRO URL";
var spreadsheet_id = "THIS IS YOUR SPREADSHEET URL";

var iframe = document.createElement("iframe");
iframe.setAttribute("name","dummyframe");
iframe.setAttribute("id","dummyframe");
iframe.setAttribute("style","display:none;");


var closebutton = document.createElement("button");
closebutton.setAttribute("id","closebutton");
closebutton.setAttribute(
  "style",
  "all:revert;z-index:90000;position:fixed;top:5px;right:40px;margin:10px;padding:5px;border:1px solid white;border-radius:5px;color:white;background-color:#35092C"
);
closebutton.innerHTML = "close";
closebutton.setAttribute("href", "#");
closebutton.onclick = function () {
  document.getElementById("electrictables").remove();
  document.getElementById("closebutton").remove();
};

var mydiv = document.createElement("div");
mydiv.setAttribute("id","electrictables");
mydiv.setAttribute("style", "font-size:14px;background-color:white;z-index:90000;position:fixed;top:50px;right:40px;border:1px solid rgba(0,0,0,0.2);border-radius:10px;width:400px;height:300px;    box-shadow: 2px 2px 8px 0 rgb(0 0 0 / 20%);");

var myform = `<div style="border-radius:10px 10px 0px 0px;width:100%;height:50px;color:white;background-color:#35092C"><span style="font-family:sans serif;font-weight:bold;font-size:18px;line-height:50px">⚡Electric Tables</span></div>
<form style="padding:20px" onsubmit="document.getElementById('submitbutton').value = 'submitted!'" target="dummyframe" method="post" action="${macro_url}">
  <input type="text" id="table" name="table" size="40" placeholder="table"><br><br>
    <input type="text" id="url" name="url" size="40" value="${window.location.href}"><br><br>
    <input type="text" id="notes" name="notes" size="40"placeholder="notes"><br><br>
<input type="hidden" id="spreadsheet" name="spreadsheet" value="${spreadsheet_id}">  
<br><br>
  <input type="submit" value="Submit" id="submitbutton">
</form>`;

mydiv.innerHTML = myform;
document.body.appendChild(iframe);
document.body.appendChild(closebutton);
document.body.appendChild(mydiv); 

electrict-tables-v0.2.gs

// 1) Host this as a script at script.google.com
// 2) Publish to the web as a macro - you'll get a URL endpoint for your function
// 3) The bookmarklet just sends a POST request to that URL containing:
// ---- URL
// ---- table (optional)
// ---- notes (optional)
// ---- spreadsheet (this is the spreadsheet key ID that tells the script which spreadsheet to save data to)
// 4) Be sure to update the hardcoded spreadsheet URLs...
// 

function doPost(e){

  var bookmarkletdata = e.parameter;
  scrapeURL(bookmarkletdata["url"],bookmarkletdata["table"],bookmarkletdata["spreadsheet"],bookmarkletdata["notes"]);

  return ContentService.createTextOutput(e.parameter["url"]); // Please add this.
  
}

function scrapeURL(url, table, spreadsheet, notes){
  var ss = SpreadsheetApp.openByUrl( "https://docs.google.com/spreadsheet/ccc?key="+spreadsheet);
  
  var contents = UrlFetchApp.fetch(url).getContentText();
  const $ = Cheerio.load(contents);

  var extracted_data = {};
  extracted_data["Timestamp"] = new Date();
  extracted_data["url"] = url;
  try{
    extracted_data["title"] = $("*[property='og:title']").attr("content");
  }catch(e){
    extracted_data["title"] = $('title').text();
  }

  
  
  
  var configsheet = ss.getSheetByName("config");
  if(configsheet){
    var configdata = configsheet.getDataRange().getValues();
    var config_rules = [];
    for(var i = 1; i < configdata.length; i++){
      var obj = {};
      obj["config_domain"] = configdata[i][0];
      obj["config_title"] = configdata[i][1];
      obj["config_rule"] = configdata[i][2];
      config_rules.push(obj);
    }
    console.log(config_rules);

    for(i in config_rules){
      if(url.includes(config_rules[i]["config_domain"])){
        console.log("trying: "+config_rules[i]["config_title"]);
        extracted_data[config_rules[i]["config_title"]] = eval(config_rules[i]["config_rule"]);
      }
    }
  }


  if(table){
    var sheet = ss.getSheetByName(table);
    if (!sheet) {
      newsheet = ss.insertSheet();
      newsheet.setName(table);
      sheet = newsheet;
      var newheader = Object.keys(extracted_data);
      sheet.appendRow(newheader);
    }
    
  }else{
    var sheet = ss.getSheets()[0];
  }

  if(notes){
    extracted_data["notes"] = notes;
  }

 var rowNum = 1;
 var headers = sheet.getRange(rowNum +":"+ rowNum).getValues()
 headers = headers[0];
 headers = headers.filter(n => n);


var nextRow = sheet.getLastRow(); 
var lastcol = sheet.getLastColumn();
 var cell = sheet.getRange('a1');
 var col = 0;

for(var i in Object.keys(extracted_data)){
    if(headers.includes(Object.keys(extracted_data)[i])){

    }else{
      headers.push(Object.keys(extracted_data)[i]);
      cell.offset(0, lastcol).setValue(Object.keys(extracted_data)[i]);

    }
 }


 for (i in headers){
    if (headers[i] == "Timestamp"){
       val = new Date();
    }
    else {
       val = extracted_data[headers[i]]; 
    }
    cell.offset(nextRow, col).setValue(val);
    col++;
 }

}