  The increasing importance of hadronic resonances in our understanding of the
Standard Model is underscored by recent advancements in lattice Quantum
Chromodynamics (QCD) calculations. We review recent developments, with a
particular emphasis on electroweak transitions that result in two-hadron final
states. Additionally, we present the finite-volume lattice QCD methodologies
that are pivotal in such studies in the context of preliminary results from the
$B\to \pi\pi\ell\bar{\nu}$.
