How can I use fill pattern on lofted surface?

Hi all,

I have a curved part obtained by a loft between different circles. After I made a shell in order to obtain a simil hollow-cylinder shape.

I attached it to the question.

Now I would like to make a holes pattern on it. I wanted to use "fill pattern" features but it seems not possible.

Do you know a way to define a holes pattern on this part?

Thanks

SolidworksParts And Features