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Dynamical energy loss formalism allows generating state-of-the-artsuppression predictions in finite size QCD medium, employing a sophisticatedmodel of high-$p_\perp$ parton interactions with QGP. We here report a majorstep of introducing medium evolution in the formalism though $1+1D$ Bjorken(``B'') expansion, while preserving all complex features of the originaldynamical energy loss framework. We use this framework to provide joint$R_{AA}$ and $v_2$ predictions, for the first time within the dynamical energyloss formalism in evolving QCD medium. The predictions are generated for a widerange of observables, i.e. for all types of probes (both light and heavy) andfor all centrality regions in both $Pb+Pb$ and $Xe+Xe$ collisions at the LHC.Where experimental data are available, DREENA-B framework leads to a good jointagreement with $v_2$ and $R_{AA}$ data. Such agreement is encouraging, i.e. maylead us closer to resolving $v_2$ puzzle (difficulty of previous models tojointly explain $R_{AA}$ and $v_2$ data), though this still remains to bethoroughly tested by including state-of-the-art medium evolution within DREENAframework. While introducing medium evolution significantly changes $v_2$predictions, $R_{AA}$ predictions remain robust and moreover in a goodagreement with the experimental data; $R_{AA}$ observable is therefore suitablefor calibrating parton-medium interaction model, independently from the mediumevolution. Finally, for heavy flavor, we observe a strikingly similar signatureof the dead-cone effect on both $R_{AA}$ and $v_2$ - we also provide a simpleanalytical understanding behind this result. Overall, the results presentedhere indicate that DREENA framework is a reliable tool for QGP tomography.

DREENA-B framework: first predictions of $R_{AA}$ and $v_2$ within dynamical energy loss formalism in evolving QCD medium