  The emergence of hadron mass represents one of the most challenging and still
open problems in contemporary hadron physics. The results on the nucleon
resonance electroexcitation amplitudes available from the CLAS data on $\pi N$
and $\pi^+\pi^-p$ electroproduction analyzed within the continuum Schwinger
method open up a new avenue for gaining insight into the strong interaction
dynamics that are responsible for the generation of the dominant part of hadron
mass. Future prospects of these studies in experiments of the 12-GeV era with
CLAS12 and after a potential increase of the CEBAF energy up to 22 GeV will
offer a unique opportunity to explore the full range of distances where the
dominant part of hadron mass and $N^*$ structure emerge from QCD.
