The ATLAS Collaboration is starting to publicly provide likelihoods associated with statistical fits used in searches for new physics on HEPData. These likelihoods adhere to a specification first defined by the $\texttt{HistFactory}$ p.d.f. template. This note introduces a JSON schema that fully describes the $\texttt{HistFactory}$ statistical model and is sufficient to reproduce key results from published ATLAS analyses. This is per-se independent of its implementation in $\texttt{ROOT} $and it can be used to run statistical analysis outside of the $\texttt{ROOT}$ and $\texttt{RooStats}$/$\texttt{RooFit}$ framework. The first of these likelihoods published on HEPData is from a search for bottom-squark pair production. Using two independent implementations of the model, one in $\texttt{ROOT}$ and one in pure Python, the limits on the bottom-squark mass are reproduced, underscoring the implementation independence and long-term viability of the archived data.