Chartjs-Quote from PHP is transformed into &#039 into JavaScript

take a look at this escaping quotes: Escaping quotation marks in PHP

if that doesnt work, you could always do a str.replace after the fact and properly convert it back

You are setting the dynamic_month variable on the PHP side, but using it in Javascript; you’ll need to replace the:

labels: {{ dynamic_month }},

With

labels: {<?php echo $dynamic_month ?>},

HTH