How do I mark the cells with a line with width on the surface of the model

Hello everyone, I would like to ask you how to draw ablation lines with a diameter of 2 mm on the surface of the atrial model as shown in this picture. How is this done in paraview?
I wonder if there is a tool like a brush or a circle that can set the diameter to 2 mm and select continuous cells on the surface of the atrium. Or there’s some other way.
Thank you all!

the ablaion line is the black line in the picture