How to use Google Tag Manager (GTM) dataLayer to send web app identity/login data to Zoho Marketinghub?

How to use Google Tag Manager (GTM) dataLayer to send web app identity/login data to Zoho Marketinghub?

MarktetingHub provides tracking code for website and web app. How do we modify that code to accept information from GTM dataLayer?

eg. This web application code:
  1. <script>var w=window;var p = w.location.protocol;if(p.indexOf("http") < 0){p = "http"+":";}var d = document;var f = d.getElementsByTagName('script')[0],s = d.createElement('script');s.type = 'text/javascript'; s.async = false; if (s.readyState){s.onreadystatechange = function(){if (s.readyState=="loaded"||s.readyState == "complete"){s.onreadystatechange = null;try{loadwaprops("x9x9x9x9x9x9x","x9x9x9x9x9x9x","x9x9x9x9x9x9x","x9x9x9x9x9x9x","0.0");}catch(e){}}};}else {s.onload = function(){try{loadwaprops("x9x9x9x9x9x9x","x9x9x9x9x9x9x","x9x9x9x9x9x9x","x9x9x9x9x9x9x","0.0");}catch(e){}};};s.src =p+"//marketinghub.zoho.eu/hub/js/WebsiteAutomation.js";f.parentNode.insertBefore(s, f);</script>
How/where would I input to send info from GTM dataLayer?

Below is example code (from another web app we have used) for tracking and to send identity/login data using GTM dataLayer.

  2. <script src = "https://ZOHOMH.js"></script>
  3. <script>
  4.   ZOHOMH.identify( 
  5.     "{{userID}}", // Used to identify users - does ZOHOMH USE SOMETHING LIKE THIS? 
  6.     { 
  7.       first_name: "{{firstName}}", // First name 
  8.       last_name: "{{lastName}}", // Last name 
  9.       emailid: "{{email}}", // Email address 
  10.       created_at: "{{createdAt}}" // Signup date as a Unix timestamp
  11.     }
  12.   );
  13. </script>
Any help/advice appreciated. I have the basic tracking working, but would like to connect identity/login information to the user.

Google Tag Manager is preferred method as dataLayer is already configured and so would not require input from dev team.

Thanks