If you have a tawk configured site and its script it can be added to the magento backend .
Careful about the script src number given from the tawk website.
For reference:
<!--Start of Tawk.to Script-->
<script type="text/javascript">var Tawk_API=Tawk_API||{}, Tawk_LoadStart=new Date();(function(){var s1=document.createElement("script"),s0=document.getElementsByTagName("script")[0];s1.async=true;s1.src='<https://embed.tawk.to/61e87dd0f7cf527e84d30972/1fpq2muqo';s1.charset='UTF-8';s1.setAttribute('crossorigin','*');s0.parentNode.insertBefore(s1,s0);})();</script>
<!--End> of Tawk.to Script-->
Paste this code in CONTENT>CONFIGRATION>EDIT THEME> FOOTER> Miscellaneous HTML
Same thing is used for all scripts to view chatbot in the page.