Downstream Filter add coloring array to upstream data

I know it is not recommended that change input data by filter, but due to some special reason (my GUI picker can only recognize and pick initial data, and cannot work for new copy from filter) I need add some new coloring array by downstream filter, I don’t know is it possible and how to do it?

I found direct update input data is useless, it will not update for upstream data’s coloring…

I don’t know is it possible and how to do it?

It is not.

Thank you Mathieu for your answers!

Best Regards,
Sharon