[qpurser]

I didn't use a hook but edited the template directly. Don't know if that is any help for you.
Bare with me as I am not a Pro in coding but here is some code I used to show 2 custom fields in the "About Me" tab under "statistics".
I had to edit the "memberinfo_block_statistics" template and used this code:

<h5 class="subblocksubhead subsubsectionhead">Last 2 Meetings attended:</h5>
<dl class="blockrow stats">
<dt>Meeting 1</dt> <dd>{vb:raw userinfo.field16}</dd>
</dl>
<dl class="blockrow stats">
<dt>Meeting 2</dt> <dd>{vb:raw userinfo.field19}</dd>
</dl>

Look at the attachment to see the result.