title: Indent message in Boost Log V2
body: <p>Boost.Log 1.75.0:</p>
  <p>We use product-wise such messages: <code>BOOST_LOG_TRIVIAL(info) &lt;&lt;  &quot;\tMessage&quot;;</code> to indent the log and highlight the the next n line belongs together (note the &quot;\t&quot; at the beginning).</p>
  <p>Is there any &quot;official&quot; to do such an indention? I read about scoped logging, but as I see it, it is only to add line at the beginning and at the end.</p>
  <p>The expected outcome would be like this:</p>
  <blockquote>
  <p>[info] - Parent message</p>
  <p>[info] - ____ indented child message</p>
  </blockquote>