We investigate collective emission from an ensemble of $N_T$ two-level target atoms (TAs) coupled to a photonic waveguide, and show that the associated superradiant scaling can be flexibly engineered by introducing an auxiliary ensemble of control atoms (CAs). By tuning the spatial configuration and coupling strengths of the CAs, the radiative intensity emitted by the TAs can be enhanced beyond, suppressed below, or restored to the standard Dicke $N_T^2$ scaling, enabled by controllable interatomic coherence. We further demonstrate interference-induced chiral superradiance, whose directionality can be markedly amplified by employing giant CAs. Using the discrete truncated Wigner approximation, we capture beyond-mean-field effects in finite-sized ensembles and reveal correlation-driven features of the superradiant dynamics. Our results provide an experimentally accessible route to manipulate superradiance and chirality in waveguide QED, opening new possibilities for engineered quantum light sources.

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• Superradiance & subradiance
• Waveguides