LaTeX rendering of a test-coverage matrix for scientific papers

coverage matrix.tex

\usepackage{nicematrix} % https://ctan.org/pkg/nicematrix?lang=en

\begin{NiceMatrixBlock}[auto-columns-width]
\[
    \begin{array}{cccc}
        & n\text{ source code items} & & m\text{ tests} \\
        C = &
        \begin{bNiceMatrix}
            c_{1,1} & c_{1,2} & \cdots & c_{1,n} \\
            c_{2,1} & c_{2,2} & \cdots & c_{2,n} \\
            \vdots & \vdots & \ddots & \vdots \\
            c_{m,1} & c_{m,2} & \cdots & c_{m,n} \\
        \end{bNiceMatrix} &
        e = &
        \begin{bNiceMatrix}
            e_{1} \\
            e_{2} \\
            \vdots \\
            e_{m}
        \end{bNiceMatrix}        
        \\ 
        & n\text{ score values} \\
        s = &
        \begin{bNiceMatrix}
            s_{1} & s_{2} & \cdots & s_{n}
        \end{bNiceMatrix}    
    \end{array}
\]
\end{NiceMatrixBlock}