Hi @rebas_saber
It is possible to add JS in the HTML header using the Custom Header Plugin. Also, you can add the HTML chunk in the sidebar using the “Custom Block Manager”.
I’ve add it as a test on our Test Drive install:
https://demo.publicknowledgeproject.org/ojs3/testdrive/index.php/testdrive-journal/article/view/special-editorial-2019
Best,
Israel