How to save Array of Integers in SQL database?

I have a problem with declaration with one of my fields in Object.

public class PhotoEntity {

   @SerializedName("mentions")
   public Array<Integer> mentions = new ArrayList<>();

   // Other fields
}

mentions - is a part of incoming JSON, looks like :

[120,55,32]

I have a question. How correctly make projection of ArrayList in SQL database?

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In the best case, as I know - I need to create separate Table and setup foreign key, but in my case it not be applicable, because the structure of PhotoEntity directly related to JSON contract.