seo – Can alternative language versions use Canonicals to fulfill the requirement to return to the original page?

Suppose I have 4 URLs.

URL 1) www.example.com/de/hauptgehalt
URL 2) www.example.com/de/similar-to-main-content

URL 3) www.example.com/fr/main-content
URL 4) www.example.com/fr/similar-to-main-content

The second URL in the list contains a canonical tag for the first URL in the list, and the fourth URL in the list contains a canonical tag for the third URL in the list.

In terms of languages, URLs 3 and 1 are alternative versions of each other and so are 4 and 2,

Google ask for it switch The version has a two-way tag, with one side pointing to the other. Is URL 2 may be show switch Tag to URL 3as URL 3 anyway has a canonical URL 4or it must refer to URL 4?