How does laravel-mongodb run db.runCommand statements?

For example, the statement db.Collection.find{} can be run using whereRaw, but it cannot be found in the official documentation of db.runCommand. What statement should be used to run it in laravel5? ?

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For example, the statement db.Collection.find{} can be run using whereRaw, but it cannot be found in the official documentation of db.runCommand. What statement should be used to run it in laravel5? ?