Zotero exporter optimized for Tana paste. This is just building on others' work. Importantly, I've added some additional protections for missing data, and created a switch statement to tweak the internal Zotero type schema to better fit my use-cases. Feel free to use or modify as you see fit.

Tana Metadata Export.js

{
  "translatorID":"dda092d2-a257-46af-b9a3-2f04a55cb04f",
  "translatorType":2,
  "label":"Tana Metadata Export",
  "creator":"Joshua Hall based upon Stian Håklev, Joel Chan, and Lukas Kawerau's work",
  "target":"md",
  "minVersion":"2.0",
  "maxVersion":"",
  "priority":200,
  "inRepository":false,
  "lastUpdated":"2022-10-23 - 14:15"
  }

  function doExport() {
    Zotero.write('%%tana%%\n');
    var item;

    while (item = Zotero.nextItem()) {
      // Set the type
      var typeS = null;
      if (item.itemType !== undefined) {
        switch(item.itemType) {
          case 'journalArticle':
          case 'conferencePaper':
            typeS = 'journal article';
            break;
          case 'tvBroadcast':
          case 'videoRecording':
            typeS = 'video';
            break;
          case 'encyclopediaArticle':
          case 'magazineArticle':
          case 'newspaperArticle':
          case 'webpage':
            typeS = 'article';
            break;
          case 'blogPost':
            typeS = 'blog';
            break;
          case 'audioRecording':
            typeS = 'interview';
            break;
          case 'manuscript':
          case 'bookSection':
            typeS = 'book';
            break;
          // case 'annotation':
          // case 'artwork':
          // case 'attachment':
          // case 'bill':
          // case 'book':
          // case 'case':
          // case 'computerProgram':
          // case 'dictionaryEntry':
          // case 'document':
          // case 'email':
          // case 'film':
          // case 'forumPost':
          // case 'hearing':
          // case 'instantMessage':
          // case 'interview':
          // case 'letter':
          // case 'map':
          // case 'patent':
          // case 'podcast':
          // case 'preprint':
          // case 'presentation':
          // case 'radioBroadcast':
          // case 'report':
          // case 'statute':
          // case 'thesis':
          default:
            // Pass through anything not specified here
            typeS = item.itemType;
        }
        typeS = ' #[[' + typeS + ']]';
      }

      // Write the title and type
      Zotero.write('- ' + (item.title || 'Unknown title') + (typeS || '') + '\n');


      // ---

      // Set citekey
      if (item.citationKey !== undefined && item.citationKey !== '') {
        // Preferred citation key reference syntax
        var citationKeyS = '@' + item.citationKey;

        // Write the citation key
        Zotero.write('  - Citation key:: ' + citationKeyS + '\n');
      }


      // ---

      // Set the author list
      if (item.creators !== undefined) {
        Zotero.write('  - Author::\n');
        for (author in item.creators){
          if (item.creators[author].firstName !== undefined && item.creators[author].lastName !== undefined) {
            // Use the full name of the author. Should be the most common situation
            Zotero.write('    - [[' + (item.creators[author].firstName || '') + ' ' + (item.creators[author].lastName || '') + ']] #[[author]]\n');
          } else if (item.creators[author].lastName !== undefined) {
            // Only use the last name
            Zotero.write('    - [[' (item.creators[author].lastName || '') + ']] #[[author]]\n');
          } else {
            // Hypothetically impossible unless your DB is inconsistent for some reason
            Zotero.write('    - Unknown author');
          }
        }
        Zotero.write('\n');
      }


      // ---

      // Set the year
      var date = Zotero.Utilities.strToDate(item.date);
      var dateS = (date.year) ? date.year : item.date;
      if (dateS !== undefined && dateS !== '') {
        // Write the year
        Zotero.write('  - Year:: ' + dateS + '\n');
      }


      // ---

      // Set the publication
      if (item.publicationTitle !== undefined) {
        Zotero.write('  - Publication:: ' + (item.publicationTitle || '') + '\n');
      }


      // ---

      // Set the Zotero link
      var library_id = item.libraryID ? item.libraryID : 0;  
      var itemLink = 'zotero://select/items/' + library_id + '_' + item.key;
   
      Zotero.write('  - Zotero link:: ' + itemLink + '\n');


      // ---

      // Set the URL for the source
      if (item.url !== undefined) {
        Zotero.write('  - URL:: ' + (item.url || '') + '\n');
      }


      // ---

      // Set the abstract summary
      if (item.abstractNote !== undefined) {
        Zotero.write('  - Abstract:: '+  (item.abstractNote || '')+ '\n');
      }
    }
  }

Still a work in progress, but this adds some important protections against missing data that's caused me problems in the past.