Laravel 5.8 query to get count on polymorphic relationships - eloquent

Question

I have the following tables where 1 page has many containables, and each containable has either lines or questions:
// Page model
class Page extends Model
{
protected $fillable = ['title'];
public function containables() {
return $this->morphMany(Containable::class, 'containable');
}
}
Example pages table data:
| id | title |
|----|--------|
| 1 | Page 1 |
// Containable model
class Containable extends Model
{
protected $table = 'containables';
protected $fillable = ['containable_id', 'containable_type'];
public function containable() {
return $this->morphTo('containable');
}
public function sequences() {
return $this->hasMany(ContainableSequence::class, 'containable_id', 'id');
}
Example containables table data:
| id | containable_id | containable_type |
|----|----------------|------------------|
| 2 | 1 | App\Page |
| 3 | 1 | App\Page |
// ContainableSequence model
class ContainableSequence extends Model
{
protected $table = 'containable_sequence';
protected $fillable = ['containable_id', 'sequencable_id',
'sequencable_type', 'order'];
public function sequencable() {
return $this->morphTo('sequencable');
}
}
Example containable_sequence table data:
| id | containable_id | sequencable_type | sequencable_id | order |
|----|----------------|------------------|----------------|-------|
| 4 | 2 | App\Line | 6 | 1 |
| 5 | 2 | App\Question | 8 | 2 |
| 6 | 3 | App\Question | 9 | 1 |
| 7 | 3 | App\Line | 7 | 2 |
// Line model
class Line extends Model
{
protected $table = 'lines';
protected $fillable = ['name'];
}
Example Lines table data:
| id | name |
|----|--------|
| 6 | line 1 |
| 7 | line 2 |
// Question model
class Question extends Model
{
protected $table = 'questions';
protected $fillable = ['name', 'marks'];
}
Example Questions table data:
| id | name | marks |
|----|------------|-------|
| 8 | Question 1 | 10 |
| 9 | Question 2 | 15 |
I am trying to perform a join the tables with polymorphic associations to get the count of line(s) and question(s) linked to a page.
Starting from a page, how can I get the counts of related lines and questions using eloquent? Thanks