How to show a linked section only if it exists, else show something else with templater scripts?

Hi there,

I like to keep my Daily Note Template visually organized and decluttered. Therefore, I add my goals for the next day with a separate template in the evening, to keep it simple until then. My Daily Note Template refers to the goal section and ![]'s it in order for them to be displayed right when I open my new daily note the next day. What I do is linking a section with ![[<% tp.date.yesterday() %># Ziele für <% tp.file.title %>]]. This works fine for me, however, I don’t write down my goals every night, which means that the section cannot be found when creating the new daily note. This basically creates a huge heading saying “Unable to find section # Ziele für 2023-12-28 in 2023-12-27” of which I cannot change the appearence. Since, as I said, I like to keep my daily notes clean, I’m looking for a way to get rid of this.

What I’m trying to do

Is finding a javascript function that I can run with templater inside my daily note template which will either embedd the section if it exists in the previous daily note, or not display anything/a simple message like “no goals defined yesterday, do it now: - ” in the case of it not being able to refer to a specific section.

Things I have tried

I’m not at all good at handeling javascript and with the help of various online tools, I figured that this could somehow work:

function embedNotes() {
  const noteSection = "![[<% tp.date.yesterday() %># Ziele für <% tp.file.title %>]]";
  const sectionExists = !!document.querySelector(`a.internal-link[href$="${noteSection}"]`);

  if (sectionExists) {
    return noteSection;
  } else {
    return "no goals";
  }
}

embedNotes();

However, I’m getting error messages from Obsidian and I’m convinced that I can’t use the linking syntax in Javascript as it stands. Could someone please help me to figure this out?

Have good day,
Rembo