Question How to import animations later on for a ready prefab in the scene

For example, we modelled a 3D object and did some animations for it, imported it to unity and adjusted scripting, colliders, shaders, animator, another lots of adjustments and made it ready to use. But we realized we wanted to add more animation. Is there a easy way to do it? (Besides creating a new animation clip in Unity for basic objects).

Until now what I am doing is create the new animation in 3D software, export the whole 3D model again and import it in unity and repeat the setup of the prefab every single time. And can we export only animations from Blender 3D? Because I couldn`t find a answer for it. If its not possible with blender, which software is good for this job?