Is there any way to insert emojis into Google Apps Script?

I have a GAS that sends automated emails and would like to include a couple of emojis. I've tried using short codes and copying/pasting, but nothing so far seems to have worked. Just wanted to see if there was anything I was missing.

Thanks!

Edit: Here's the code:

var title = rowData.publicationTitle;
var journal = rowData.journalTitle;
var url = rowData.publicationUrl;

//Emoji goes here in the body:
var body = "Hi " + firstName + "!<br><br>I noticed your article <a href='" + url + "'>&ldquo;" + title + "&rdquo;</a> was recently published in <i>" + journal + "</i>. Congratulations! This is just a friendly reminder to please upload your original document and a PDF version to our publications app when you have time.<br><br>To upload your publication, you can <a href='http://support.cpes.vt.edu/publishing'>click here</a>.<br><br>Thanks!<br><br>🤖 CB<br><br><hr style='background-color: #d8d8d8; border: 0 none; color: #d8d8d8; height: 1px;'><span style='font-size:12px'><b>CPES Publications Reminders</b>&nbsp;&nbsp;|&nbsp;&nbsp;<a href='mailto:leshutt@vt.edu' style='text-decoration:none'>Feedback</a>&nbsp;&nbsp;|&nbsp;&nbsp;<a href='http://support.cpes.vt.edu/publishing' style='text-decoration:none;'>Publication uploads</a></span>";

var emailSubject = "Just a reminder to upload your article!";

var me = Session.getActiveUser().getEmail();
var aliases = GmailApp.getAliases();

if (emailStatus == "Pending"&& emailData !== "No emails found"){
  GmailApp.sendEmail(email, emailSubject, body, {
    from: aliases[2],
    name: "CPES Bot",
    htmlBody: body
  });
}

Edit 2: I've noticed that sending a star ("⭐") works, but the normal smiley ("😊") shows up as a black-and-white, Unicode-esque icon and everything else I've tried are question marks. Can you only use emojis up to a certain Unicode release?