it is possible to add repository or service interface/struct in this resolver struct?

I have project using gqlgen , and I am trying to migrate to using DDD pattern for this project, in my resolvers.go:

type Resolver struct{}

type mutationResolver struct{ *Resolver }
type queryResolver struct{ *Resolver }

func New() *Resolver{
    return &Resolver{}
}

func (r *mutationResolver) DeleteDocument(ctx context.Context, id string) (bool, error) {
           panic("not inplemented yet")
}

here for DeleteDocument was generated by gqlgen and in that DeleteDocument I do some logi and do data manipulation, I was using a function on another file like this:

/*
folder_document
  - delete_document.go
*/

func DeleteDoc(ctx context.Context, id string) (bool, error) {
     // some logic 
     // after pass logic delete document
     // return true if success
}

// and then on `resolvers.go` for function DeleteDocument
func (r *mutationResolver) DeleteDocument(ctx context.Context, id string) (bool, error) {
           success, err := folder_document.DeleteDoc(ctx, id)
           // return .....
}

you can see that I do logic and manipulation data in one function, and it might gonna have 10 - 100 lines or so, and it gonna hard for my team to read my code for it

so I am thinking about split it into struct like ddd pattern , example:

/*
folder_document
  - repository.go
  - service.go 
  - interfaces.go
*/

// interfaces.go 
type DocumentRepo interface {
   DeleteDoc(ctx context.Context, id string) (bool, error)
}

type DocumentService interface {
   DeleteNewDoc(ctx context.Context, id string) (bool, error)
}

// repository.go

type documentRepository {
  db *mongo.Client or *sql.db
}

func (useDB *documentRepository) DeleteDoc(ctx context.Context, id string) (bool, error) {
   // manipulation data
}

// service.go 

type documentService struct {
  docRepo DocumentRepo
}

func (userService *documentService) DeleteNewDoc(ctx context.Context, id string) (bool, error){
    _, _ = userService.docRepo.DeleteDoc(ctx, id)
}

it is possible to use that service in file resolvers.go ??

here is how I run the service on main.go:

func graphqlHandler() echo.HandlerFunc {
    config := resolver.Config{
        Resolvers: resolver.New(),
    }

    h := handler.NewDefaultServer(resolver.NewExecutableSchema(config))

    return func(c echo.Context) error {
        h.ServeHTTP(c.Response(), c.Request())
        return nil
    }

u can see that resolver.New() it got from resolvers.go