I can't figure out how to pass the get parameter to ExtraFields?

Question

Yii

There is a playlist model and in it, in extrafields, a connection with the "video" table is indicated. The client will send a get with the 'language' parameter of the video, and how can I pass the 'language' parameter to video so that the selection of related data follows the condition of the 'language' parameter.

https://site.ru/restapi/playlist/?language=ru&expand=video

How to pass this parameter ?language=ru to expand=video so that the video outputs where the field language = ru