> I want a telescope to find an atmosphere proving that jungles exist on other planets today.

In this case you would be most interested in NASA’s planned LUVOIR telescope[1]. In an interview the gentleman in charge of preliminary design claims that it will answer the question with a 95% certainty.[2]

[1] https://asd.gsfc.nasa.gov/luvoir/science/

[2] https://youtu.be/MMQvjpcbkBU