shape offset-outline

Hello friends Is there a plugin that makes it possible to offset or outline to shape without having to go down to the subobject spline level? A modifier that knew how to take any shape (arc, rectangle, etc.) and make it outline with a value I could give it - for example 20 cm. And that I can always go back to the shape level With option: 1. From the center 2. With positive value 3. With a negative value And the same as above only this time offset and not outline (for me outline is to make a closed shape obtained from two parallel lines. And offset is a parallel shift to the original shape). somthing like advoutline plugin and not as itoosoft spline offset Thanks