AutoFiller without source code version With All Features Included & affordable: https://assetstore.unity.com/packages/tools/utilities/auto-filler-fill-all-fields-automatically-209702

(Source Code & DLL both Included in this asset)

Usage & Details:

Use Fill attribute at any field except int, string, float, double which are not required to be filled. There will be a nice Fill button in front of the field in the inspector to fill the field. By default, it will find the required Component at the self game object, if not found then it will find it on the parent game objects till root.

Different Ways Of Use:

• [Fill] , [Fill(FindIn.SelfTParent)]

The default fill attribute will find the required game object on the self component if not found then find it on parent game objects till root.

• [Fill(“MyGameobject/ChildObject/Nested”)]

It will find the required component at the specified path.

• [Fill(FindIn.Child)]

It will find the required component in child game objects.

• [Fill(FindIn.Parent)]

It will find the required component in parent game objects.

• [Fill(FindIn.Self)]

It will find the required component at the self game object.

See the docs for more details

AutoFiller Documentation Link