How to set alternate and canonical tags for modx?

Question

MODX

There is a multilingual site on modx.
And there is one head chunk for versions of the site in which the rel="alternate" and rel="canonical" tags are specified.
Let's say in Russian version

<link rel="canonical" href="https://site.ru/" >
<link rel="alternate" href="https://site.ru/en" />

and vice versa

<link rel="canonical" href="https://site.ru/en" >
<link rel="alternate" href="https://site.ru/" />

Tell me a solution or where to look?