I would suggest you to better read about what Google lens is and in which particular apps it is available.
"On March 5, 2018 Google officially released Google Lens to Google Photos on non-Pixel phones. Support for Lens in the iOS version of Google Photos was made on March 15, 2018." This piece was on Wikipedia about Google lens.
It seems to be a staged rollout. Samsung's flagships got it and now, Oneplus phones are getting it. This indicates that it's a staged rollout. Now, whether Samsung or Oneplus told Google to give lens feature to their phones or Google on its own decided to do so is unknown.
And right now, it's only available in English.
Also,check this lino https://www.xda-developers.com/samsung-galaxy-s9-galaxy-s8-note-8-google-lens/
Google says it will roll out to more compatible flagships. Now, who decides that is unknown.