[RSS Feed/News] Find posts by max characters length?

[XenForo]

Is there a way to find posts by max characters?
I wanna do something like in this query
SELECT * FROM xf_posts WHERE CHAR_LENGTH(message)<10;

with $finder, something like
PHP:

public function isCharacterLengthLongerThan($max = 10)
{
    $this->where(CHAR_LENGTH(message), '<', $max);
    return $this;
}

PHP:

$finder = \XF::finder('XF:Posts');
$users = $finder->isCharacterLengthLongerThan(15)->order('post_date', 'DESC')->limit(10);

is this possible...

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