The Quick Toss maneuver from Tashas Cauldron indicates a ranged attack can be made with a bonus action for expending a superiority die.
Could you quickly toss a Magic Stone? How much damage would it do?
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Quick Toss states (emphasis mine):
As a bonus action, you can expend one superiority die and make a ranged attack with a weapon that has the thrown property. [...]
The magic stone cantrip states:
[...] You or someone else can make a ranged spell attack with one of the pebbles by throwing it or hurling it with a sling. If thrown, it has a range of 60 feet. [...]
The attacks from magic stone are spell attacks1 and so do not use a weapon, and the stones also do not have the actual thrown property.
1 Note that when using a Sling, though you are not making a weapon attack and are instead making a spell attack, you are making an attack that uses a weapon. However, the Sling does not have the thrown property, so this doesn't work either.