How to print negative numbers within a parenthesis with spreadtab in LaTex - format

Question

I am trying to produce financial statements with latex. An important convention of financial statements is that negative numbers are not presented with a negative sign, rather wrapped in parentheses, like this:
-100 -> (100)
The minimum necessary recreation of my issue is as follows:
\documentclass{report}
\usepackage{tabularx}
\usepackage{spreadtab}
\usepackage{numprint}
\npthousandsep{,}
\begin{document}
\begin{center}
\STautoround{0}
\begin{spreadtab}{{tabularx}{\linewidth}{XN{7}{0}N{7}{0}}}
#\multicolumn{3}{c}{\uppercase{Municipal Government}}\\
#\multicolumn{3}{c}{Statement of Net Position}\\
#\multicolumn{3}{c}{December 31, 2019}\\
&& \\
#\multicolumn{1}{c}{\uppercase{Assets}} & #\multicolumn{1}{c}{2019} & #\multicolumn{1}{c}{2018}\\
#\multicolumn{1}{c}{Current Assets}&&\\
# Cash & 12345 & 54321\\
# Receivables:&&\\
# \hspace{0.25in}Sewer Fees: & 12345 & 54321\\ \cline{2-3}
#\multicolumn{1}{r}{Total Current Assets} & sum(b7:[0,-1]) & sum(c7:[0,-1])\\ % r10
#\multicolumn{1}{c}{\uppercase{Fixed Assets}}&&\\
# Land & 12345 & 54321\\
# Garage & 99247 & 54321\\
# Equipment & 12345 & 54321\\
# Lagoon and Related & 12345 & 54321\\ \cline{2-3}
#\multicolumn{1}{r}{Total Fixed Assets} & sum(b12:[0,-1]) & sum(c12:[0,-1])\\ \cline{2-3} % r15
# Accumulated Depreciation & -12345 & -54321\\ \cline{2-3}
#\multicolumn{1}{r}{Net Fixed Assets} & sum(b16:[0,-1]) & sum(c16:[0,-1])\\ \cline{2-3}
#\multicolumn{1}{r}{Total Assets} & b18+b10 & c18+c10\\ \cline{2-3} \cline{2-3}
\end{spreadtab}
\end{center}
\end{document}
Where rather than Accumulated Depreciation -12345 -54321, it reads Accumulated Depreciation (12345) (54321).
I have found scant little information about it online, and I'm not entirely certain it's possible to do.
If at all possible, I would like to retain the decimal alignment while adding the parentheses. But again, I'm not sure it's possible.
A solution, below, was shared on StackOverflow several years ago, but it concludes in several errors which I am unsure how to move beyond: primarily the compiler complaining about dozens of "missing" or "extra" brackets.
\makeatletter
\renewcommand\STprintnum[1]{\FPifneg{#1}(\#gobble#1)\else#1\fi}
\makeatother
Update: Per the below answer, using SIunitx permits wrapping negative numbers in brackets, but this breaks the decimal alignment. A minimum working example of this is as follows:
\documentclass{report}
\usepackage{tabularx}
\usepackage{siunitx}
\usepackage{spreadtab}
\sisetup{group-separator = {,}}
\sisetup{bracket-negative-numbers = true}
\begin{document}
\begin{spreadtab}{{tabularx}{\linewidth}{XS[table-format=7.1]S[table-format=7.1]}}
# Fixed Assets & 123456.1 & 135791.1\\
# {Accumulated Depreciation} &-100000.1 &-90000.1\\ \cline{2-3}
#\multicolumn{1}{r}{Net Fixed Assets} & sum(b1:[0,-1]) & sum(c1:[0,-1])\\ \cline{2-3}
\end{spreadtab}
\end{document}
In the above example, the negative numbers are now offset in their alignment by the left and right parenthesis, so they cease to line up with the positive numbers.