How to convert a query to a Relation AR relationship in Yii2?

Question

Yii

There is a request object:

(new ActiveQuery())
                        ->select('sum(`value`)/count(*)')
                        ->from('assessment')
                        ->where('video_id = video.id')
                        ->andWhere(['type' => 1])

where assessment is a table of video ratings, the
connection is made through video_id=> video.id
I would like to get such a connection:

$video->truth

public function getTruth(){
...
}

but I don't understand how to do it. in fact, the hasOne|hasMany methods also return ActiveQuery, but how to connect? thank.