Siunitx bold units in math mode

Question

\documentclass{article}
\usepackage{unicode-math}
\setmainfont{Times New Roman}
\setmathfont{STIX Two Math}
\usepackage{tikz}
\usepackage[reset-math-version = false]{siunitx}
    
\begin{document}

\tikz \node[draw=red, ultra thick, font=\bfseries, text width=4cm, text centered] (a) {Some 
text\\ size is $\qty{5}{\milli\meter} \times \qty{5}{\milli\meter}$};

\end{document}

How to make qty print number and unit in bold as surrounding text? I also tried {\boldmath $...$}, doesn't work.

Thank you.

EDIT

With suggestion from Joseph Wright's answer I get:

\documentclass{standalone}
\usepackage{unicode-math}
\setmainfont{Times New Roman}
\setmathfont{STIX Two Math}
\usepackage{tikz}
\usepackage[text-series-to-math]{siunitx}

\begin{document}
    
\tikz \node[draw=red, ultra thick, font=\bfseries, text width=4cm, text 
centered] (a) {Some text\\ size is $\qty{5}{\milli\meter} \times \qty{5} 
{\milli\meter}$\\ 5\,mm and $\mathbf{5}\,\text{mm}$};
    
\end{document}

I can only get all in bold by hand, as in the last row. Probably I don't understand the suggestion of text-series-to-math.

Answer 1

Try this:

\documentclass{article}
\usepackage{unicode-math}
\setmainfont{Times New Roman}
%\setmathfont{STIX Two Math}    % I haven't this font
\usepackage{tikz}
\usepackage{siunitx}

\begin{document}

\tikz   \sisetup{detect-weight, mode=text} 
        \node[draw=red, ultra thick, font=\bfseries, text width=4cm, align=center] (a) 
                {Some text\\ size is \qtyproduct{5x10}{\milli\metre}};

\end{document}

Note: I'm still not familiar with siunitx syntax introduced by version 3.0, so there may be more appropriate option as are used in above MWE.

Answer 2

You are sending bold from text to math mode: you want text-series-to-math. In contrast, reset-math-version = false is about 'carrying forward' for example sansmath.

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Your edit suggests you want siunitx to print in text mode. For that, you set mode = text, then also apply reset-text-series = false so the series (bold, etc.) carries through.

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In general, siunitx starts off using math mode, and unless you request it doesn't print in text mode. When you request text mode printing, it does it's best to make sure all symbols are 'safe', so for example replacing \times by \texttimes.