How to update a theme from a public app

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I am developing a public app that needs to create a dynamic section into product page. Is this thing possible? I read that dynamic section can not be added except to the home page, but I still need to add some code in the product pages. I tried to add some new content with but it seems that I do not have enough rights to write_theme, how can I change right in a public app to allow writhe_theme scope? (for private app I manage to change the rights)