I don’t see any good reasons for doing this as it (at least with the bigger brushes) most likely will cause nothing but lag, but if you insist i believe you can find a recent file within your BuiltInPlugins directory for Roblox Studio.
If you’re having trouble finding it, this is the path you’ll need to head to: C:\Users\[YourUsername]\AppData\Local\Roblox Studio\BuiltInPlugins