How do i define a relation in the schema? or generate the schemas from the entities?

[meir]

Im working on a small project using Dioxus and Sea-orm, however, im a little confused on the docs.
In the docs it states that you have to work schema first and generate the entities from the schema.
However all the database relations docs are about the entities?

Is it possible to generate the schemas using the entities or to define a database relationship easily in the schema? I cant find anything about this in the docs.

https://www.sea-ql.org/SeaORM/docs/migration/setting-up-migration/
https://www.sea-ql.org/SeaORM/docs/next/relation/many-to-many/