how to dymiclly inject a repository in Nestjs

Question

I want to create a service that receives an entity and creates a repository

this is my trials:

export class MyService<T extends ObjectLiteral> {
  protected repo: Repository<T>;

  constructor(entity: T) {
   let token = getRepositoryToken(entity);
   this.repo = InjectRepository(entity)(this, 'repo');
  }

// methods
}

usage:

let service = new MyService(MyEntity)
service.repo.findmany()