Question 6 LODS of a tree. But the LOD4 is a pre-render

Hello, I wanted to ask if what I say in the title is possible and how to do it.
I am playing with a project with a terrain where it has many trees with their LODs. But I would like those trees to be seen from far away. And I was wondering how I could create a LOD that was a pre-render of the LOD0 making the trees visible from afar without the high cost of triangles.

 

Are you perhaps looking for the term impostors?

There are asset store and github projects to do impostors.

 

WOW your answer was very fast, and what you say is more or less what I want to do. Thanks <3