Sorry, Image::Magick hasn't what you are looking for; you can of course build your own system using QueryFontMetrics; here is an example of its usage:
#!/usr/bin/perl
use Image::Magick;
$i = Image::Magick->new;
$i->Set( size => '320x200' );
$i->ReadImage('xc:white');
@params = ( font => '@arial.ttf',
text => 'some text',
pointsize => 36 );
($w, $h,
$ascend, $descend,
$text_w, $text_h,
$max) = $i->QueryFontMetrics( @params );
print "$w, $h, $ascend, $descend, $text_w, $text_h, $max\n";
$i->Annotate( @params,
stroke => red,
fill => red,
gravity => center );
$i->Display;
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