Emission spectroscopic metric (ESM) vs. period plot of all currently detected transiting rocky USPs around M dwarfs with a constrained mass and radius. LHS 3844 b is plotted as well although no published mass is available because it is one of the most extensively studied USPs (Kreidberg et al. 2019). The ESMs for all planets were taken from the respective discovery publications. The colour bar indicates the equilibrium temperature, and planets that have already been observed with JWST are marked as squares. TOI-4552 b has an ESM of 19.5 and is the third shortest period, making it a high-value target for emission spectroscopy.