Parse variants of \cancel from the cancel package as non-standard symbolic units

[peaR-red]

This TeX.SE post reveals that variants of \cancel from the cancel package, namely \bcancel and \xcancel, forces literal mode which leads to unwanted behavior. I've thus provided a workaround that parses the aforementioned variants in the same way as how the package parses \cancel, leveraging the internal control sequence \__siunitx_set_symbolic:Npnn found in siunitx-unit.dtx:

\documentclass{article}

\usepackage{siunitx,cancel}

\ExplSyntaxOn
\__siunitx_unit_set_symbolic:Npnn \bcancel
    { }
    { \__siunitx_unit_parse_special:n { \bcancel } }

\__siunitx_unit_set_symbolic:Npnn \xcancel
    { }
    { \__siunitx_unit_parse_special:n { \xcancel } }

\AtBeginDocument {
    \cs_if_exist:NT \bcancel
        {
            \cs_set_protected:Npn \__siunitx_vcancel:n #1
                { \__siunitx__real_bcancel:n { \__siunitx_print:nn { unit } {#1} } }
            \cs_set_eq:NN \__siunitx__real_bcancel:n \bcancel
            \seq_put_right:Nn \l_siunitx_unit_symbolic_seq { \bcancel }
            \cs_new_protected:cpn
                { __siunitx_ \token_to_str:N \bcancel _function:w }
                { \__siunitx_unit_parse_special:n { \__siunitx_bcancel:n } }
        }
    \cs_if_exist:NT \xcancel
        {
            \cs_set_protected:Npn \__siunitx_xcancel:n #1
                { \__siunitx__real_xcancel:n { \__siunitx_print:nn { unit } {#1} } }
            \cs_set_eq:NN \__siunitx__real_xcancel:n \xcancel
            \seq_put_right:Nn \l_siunitx_unit_symbolic_seq { \xcancel }
            \cs_new_protected:cpn
                { __siunitx_ \token_to_str:N \xcancel _function:w }
                { \__siunitx_unit_parse_special:n { \__siunitx_xcancel:n } }
        }
}
\ExplSyntaxOff

\begin{document}

\[
  \qty[per-mode=power]{2}{\cancel\metre\per\second}
\]

\[
  \qty[per-mode=power]{2}{\bcancel\metre\per\second}
\]

\[
  \qty[per-mode=power]{2}{\xcancel\metre\per\second}
\]

\end{document}

The resulting output is:

Could this be added to siunitx?