Here’s a full 1:1 solution:
Just make your own, new tonemapper material, making sure material domain is set to “Post Process” and (a little but further down in the material details, in the Post Process Material section) set “Blendable Location” to “Replacing the Tonemapper”.
Finally, in a postprocess-volume details, add the new tonemapper material to the pp materals array (found under “rendering features”).