Is it possible to save an adjustment layer?

https://forums.adobe.com/people/Am_I_Lame%3F  wrote ...it would be nice to save a stack of them to apply multiple adjustments to other photos.  Since some adjustment layers don't let you save them, is there another way to do this?...I'd prefer a solution that let's me save the final saturation setting, brightness, setting, curve, etc.

The closest you will probably get is with a layer group.

Set up all the adjustment layers you'll need, then group them (put them in a folder in the Layers panel). You can drag that layer group to another document, and when you do that, all the layers inside the group are added to the destination document in that single drag. You’ll probably have to tweak the stack of adjustment layers for individual images, but at least they're already present with initial values.

If you want to keep this layer group around for easy access, drag the layer group into a blank Photoshop document and save that. Whenever you want to apply that stack of adjustment layers, open this document and drag the layer group into the document the needs it.

If you want to apply the layer group to many images, you can probably build an action that would do that, and it would probably run faster than an action that recorded a series of steps.