As it could not be very high price as you may need to change the phone every 2 year (or every 1 year, did you?)
Anyway, we've made a 18X-30X zoomable Tele lens:
and we made it with multi phones too:
For example: Gaaxy S9
iPhone too:
and a universal clip:
It even comes with an eye attachment for you:
Have a look to the kits:
It is an exaggeration, not really can use it to zoom to a tiger, but you can have a look when it it on an iPhone from the screen side:
We have videos for this kit too:
Link for the kit:
https://dckina.com/index.php?main_page=product_info&cPath=6&products_id=2360