how to extend qweb template “wysiwyg.widgets.video” in odoo14?

I want to add some content after video setting options in template ‘wysiwyg.widgets.video’, then I write the code in my custom module:

 
some content-

but it throw an error says that module "wysiwyg" not found, then i change the code to:

 
some content-

after update module, there no error, but it doesn't appear, how can i make it work?
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