How to combine two sprites into one? [Solved]

I want to use a lighting effect by using normal maps, the problem, it is too costly for fps.

And I have an idea to merge an image with normal map to the background, to make it as usual sprite.

Is it possible?

I tried paster plugin, but the project does not start with this plugin

IF somebody is interested in how to do it

You can apply any effects to the background for example, and then turn it into one simple image, to save fps