如何在Yii2 Datafilters或REST API GET REQUEST中的列中查找具有NULL值的记录？

I am trying to filter result that contains NULL value in a column in my rest api Yii2 Application.

There are many operators provided in datafilters but NULL checking filters seems to be missing and that's why I'm having trouble in filtering Please help me in making a GET request that have a NULL Filter working.

e.g : {{baseUrl}}/projects?filter[**StudentStatus**]=4

I need studentStatus to 4 or NULL.