How to display a link to the current page in another language in Opencart 2?

Question

opencart

Hello.
I need to display hreflang on Opencart pages. SEO modules that also have the function of adding these lines will not work for me, because the site is already using another SEO module that cannot be changed.
You can manually display hreflang, but for this you need to understand what function can display a link to the same page in another language on the current page. Can't figure out how?
Can you help?