Laravel morph child relationship eager loading

We have a few tables related as such:

• Mission is our main table (has two columns for morph relation to the next tables: modality_type and modality_id)

Then we have various tables which contain meta data about the mission, depending on its type:

• AnnualStatementModality
• NewCompanyModality

And finally some other tables which can be related to some modalities (but not all)

• Company (related to NewCompanyModality and AnnualStatementModality, with a simple HasMany)
• FiscalYear (related to AnnualStatementModality, with a simple HasMany)

And here is our issue

We have a dashboard which lists all missions and displays some important information about them. Query looks like that:

Mission::with(['modality'])->get()

This is all good. But if we need to show information from a table related to the modality, we start getting N+1 queries.

We cannot go like that:

Mission::with([
   'modality',
   'modality.company',
   'modality.fiscal_year',
])->get()

Because some modality classes do not have the fiscal_year relationship and this results in an exception being thrown.

How could we get eager loading when relationship exists?

you can specify what relations to load based on the type of morph parent

docs: https://laravel.com/docs/11.x/eloquent-relationships#nested-eager-loading-morphto-relationships

Mission::query()
  ->with(['modality' => function (MorphTo $morphTo) {
        $morphTo->morphWith([
            AnnualStatementModality::class => ['company', 'fiscal_year'],
            NewCompanyModality::class => ['fiscal_year'],
            /** other cases as needed */
        ]);
    }])