While we have not found life on TOI-1452b, TOI-1452b is a great candidate for alien life due to the possibility of the planet being covered in an ocean of liquid water.
While we have not found life on Kepler-186f, Kepler-186f is a candidate for alien life due to many terrestrial planet similarities to Earth and possible surface liquid water.
Proxima B is a great candidate for containing life due to its similar mass to the Earth, the possibility of liquid water, and its proximity to its host star, Proxima Centauri.