1. You could use JOINs for that (many to many relationships between stores / products) https://typesense.org/docs/27.1/api/joins.html#one-to-one-relation 2. If you do want to go with the nested objects, you'd have to have an

id

key and

sizes

key like

instockinstores: {
 id: string;
 sizes: number[]
}

Keep in mind this is typescript syntax. For Typesense syntax you'd have to have instockinstores be an

object[]

and then id and sizes be nested under it