  The jet radial structure and particle transverse momentum ($p_{\rm{T}}$)
composition within jets are presented in centrality-selected Pb-Pb collisions
at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. Track-based jets, which are also called
charged jets, were reconstructed with a resolution parameter of $R=0.3$ at
midrapidity $|\eta_\mathrm{ch\,jet}|<0.6$ for transverse momenta
$p_\rm{T,\,ch\,jet}=30$-$120$ GeV/$c$. Jet-hadron correlations in relative
azimuth and pseudorapidity space ($\Delta\varphi$, $\Delta\eta$) are measured
to study the distribution of the associated particles around the jet axis for
different $p_\rm{T, assoc}$-ranges between 1 and 20 GeV/$c$. The data in Pb-Pb
collisions are compared to reference distributions for pp collisions, obtained
using embedded PYTHIA simulations. The number of high-$p_{\rm{T}}$ associate
particles ($4<p_\rm{T, assoc}<20$ GeV/$c$) in Pb-Pb collisions is found to be
suppressed compared to the reference by 30 to 10%, depending on centrality. The
radial particle distribution relative to the jet axis shows a moderate
modification in Pb-Pb collisions with respect to PYTHIA. High-$p_{\rm{T}}$
associate particles are slightly more collimated in Pb-Pb collisions compared
to the reference, while low-$p_{\rm{T}}$ associate particle tend to be
broadened. The results, which are presented for the first time down to
$p_\rm{T,\,ch\,jet}=30$ GeV/$c$ in Pb-Pb collisions, are compatible with both
previous jet-hadron-related measurements from the CMS Collaboration and jet
shape measurements from the ALICE Collaboration at higher $p_{\rm{T}}$, and add
further support for the established picture of in-medium parton energy loss.
