Hi GmailJS Team,

FYI that I had updated code to refer jQuery & added below code & it is working,
const trustedHTMLpolicy = trustedTypes.createPolicy("default", {
createHTML: (to_escape) => to_escape,
});

$.extend({
htmlPrefilter: trustedHTMLpolicy.createHTML // this is the actual function which jQuery needs
});

But gmail.tools.add_toolbar_button() method used to add buttons to toolbar is not working & showing below error in console,

jquery.module.min.js:2 Uncaught TypeError: Illegal invocation
at T.fn.init. (jquery.module.min.js:2:44823)
at Y (jquery.module.min.js:2:6326)
at T.fn.init.html (jquery.module.min.js:2:44634)
at create_generic_toolbar_button (gmail.js:3673:16)
at Gmail.api.tools.add_toolbar_button (gmail.js:3690:16)
at extension.js:25:19
at gmail.js:2745:28

Please let me know how to address it.

Thanks in Advance,
Shashikiran