threeparttable: How to write tablenotes in \Alph letter format?

Question

Consider the following Minimum Working Example (MWE):

\documentclass{article}
\usepackage{tabularx}
\usepackage{threeparttable}

\begin{document}
    \begin{table}
        \begin{threeparttable}
            \begin{tabularx}{0.5\textwidth}{ccX}
                Value   & Text  & Author \\\hline
                5       & Bla   & \tnote{1}\\\hline
            \end{tabularx}
            \begin{tablenotes}
                \item[1] {This is the tablenote}
            \end{tablenotes}
        \end{threeparttable}
    \end{table}
\end{document}

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Screenshot of the result:

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Description of the issue:

I want to let the tablenotes appear as \Alph letters in normal font of current text line instead of \textsuperscript mode. The config should be valid just locally for this single table and not globally. How to do so?

Either \begin{threeparttable}[online] nor \begin{tablenotes}[online] did work like expected.

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Update: Also the "source" letter in the table itself should be in normal text mode, not only the tablenote.

Answer 1

Just define a new command for that. I added a thinspace and a pair of parentheses to distinguish it from the rest of the cell content:

\documentclass{article}
\usepackage{tabularx}
\usepackage{threeparttable}
\def\Tnote#1{\protect\TPToverlap{\,\TPTtagStyle{(#1)}}}%
\begin{document}

    \begin{table}
\def\tnote#1{\protect\TPToverlap{\textsuperscript{\TPTtagStyle{#1}}}}%
        \begin{threeparttable}
            \begin{tabularx}{0.5\textwidth}{ccX}
                Value & Text & Author \\\hline
                5 & Bla & Blah\Tnote{A}\\\hline
            \end{tabularx}
            \begin{tablenotes}[online]
                \item[A] {This is the tablenote}
            \end{tablenotes}
        \end{threeparttable}
    \end{table}

\end{document}