HST ACS F814W imaging cutout of RXJ1131−1231, illustrating the prominent lens configuration with a quadruply imaged background quasar (A, B, C, and D) and a nearby satellite (S). Spectroscopic measurements locate the lens and quasar at redshifts z_d = 0.295 and z_s = 0.654, respectively. We generated mock imaging data that closely resemble the archival HST data shown here, based on a best-fitting lensing model and excluding the satellite. Overlaid is the JWST NIRSpec nominal FOV of 3″×3″, within which we create mock stellar kinematics of the foreground lens at 0.1″ pixel⁻¹ resolution. The FOV is oriented such that the x-axis is aligned with the galaxy major axis.