The JWST program, LEGGOS (Lensing and Galaxy Growth: Observing Substructures), is comprised of NIRCam imaging and NIRSpec IFU spectroscopy on a sample of 8 strongly-lensed galaxies at redshifts from ~2.4 to ~3.6 (6 new targets, 2 archival), enabling detailed spectrophotometric modeling of around 200 unique clumps with a median clump magnification of about 20 and a maximum in the hundreds. First, I will discuss results of an image-plane search for clumps that may be leaking Lyman-continuum (LyC) emission. Understanding how LyC photons escape from galaxies is critical to understanding the reionization of the universe. Rivera-Thorsen et al. (2019) found that a single star-forming clump was responsible for the LyC emission in one gravitationally-lensed galaxy, the Sunburst Arc. The hunt is now underway for more examples with such high spatial resolution. The aim is to build a sample to study how the interactions between these substructures and their host galaxies enable ionizing photons to escape. I will report on the search for more LyC leaker candidates within the LEGGOS sample based on both photometric and spectroscopic diagnostics. However, image-plane studies like this only scratch the surface of what can be done with JWST observations of lensed galaxies. I will also discuss ongoing work to make robust source-plane measurements of clump properties through forward-modeling approaches and the eventual implications for galaxy mass assembly and evolution.