is there an easy way to convert unity's Navmesh to normal mesh?

i'm trying to use Astar pathfinding and want to use the "Navemesh Graph".

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tried using blender as it's suggest in this documentation but the problem is you need to rebuild/export your scene to blender and build it manually (as far as i understand it).

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another solution i've found is to convert unity's NavMesh to normal mesh

my problem now is all that all the information i've found about this subject is 6-8 years old information that i have no idea how to use; like this code:

  NavMeshTriangulation triangles = NavMesh.CalculateTriangulation();
  Mesh mesh = new Mesh();
  mesh.vertices = triangles.vertices;
  mesh.triangles = triangles.indices;

like do i put the script in an empty game object and play the scene or what do i do with it?

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so now my question is "is there an easy way to convert unity's Navmesh to normal mesh? or use unity's navmesh in Astar without the need to convert to normal mesh?"