 each of the following JSON-related subcommands, if the optional
<code class="docutils literal notranslate"><span class="pre">ERROR_VARIABLE</span></code> argument is given, errors will be reported in
<code class="docutils literal notranslate"><span class="pre">&lt;error-variable&gt;</span></code> and the <code class="docutils literal notranslate"><span class="pre">&lt;out-var&gt;</span></code> will be set to
<code class="docutils literal notranslate"><span class="pre">&lt;member|index&gt;-[&lt;member|index