planetary transits of TRAPPIST-1, Proxima Centauri b, Kepler-186f ?

Hello,

I’m interested in developing a project that considers the planetary transits of TRAPPIST-1, Proxima Centauri b, Kepler-186f, and LHS 1140b. It appears that these planets are only observable during their transits in front of their respective parent stars. Is it feasible to acquire a forecast calendar for these transits, similar to what we have for Mercury or Venus?

Thx