All Monks of level 3 and higher have the trait "Deflect Missiles".
A Monk can multiclass into one of the classes that offer a fighting style, and take the fighting style "Thrown Weapon Fighting".
Starting at 3rd level, you can use your reaction to deflect or catch the missile when you are hit by a ranged weapon attack. When you do so, the damage you take from the attack is reduced by 1d10 + your Dexterity modifier + your monk level.
If you reduce the damage to 0, you can catch the missile if it is small enough for you to hold in one hand and you have at least one hand free. If you catch a missile in this way, you can spend 1 ki point to make a ranged attack with a range of 20/60 using the weapon or piece of ammunition you just caught, as part of the same reaction. You make this attack with proficiency, regardless of your weapon proficiencies, and the missile counts as a monk weapon for the attack.
Thrown Weapon Fighting.
You can draw a weapon that has the thrown property as part of the attack you make with the weapon.
In addition, when you hit with a ranged attack using a thrown weapon, you gain a +2 bonus to the damage roll.
If a Monk, via the "Deflect Missiles" feature, was to reduce the damage of a ranged weapon attack to 0, and spend the ki point needed to make an attack with the missile, would they add a +2 to the damage roll because of thrown weapon fighting?