ref – https://www.grammar-monster.com/glossary/object_complement.htm

They come right after the direct object, and is a noun/pronoun/adjective.

Here are some more examples of object complements:

I found the guard sleeping.

direct object – guard
object complement – sleeping

We all consider her unworthy.

direct object – her
object complement – unworthy

I declare this centre open.

direct object – this centre
object complement – open

We consider fish spoiled once it smells like what it is.

direct object – fish
object complement – spoiled

To obtain a man’s opinion of you, make him mad. (Physician and poet Oliver Wendell Holmes)

direct object – him
object complement – mad

An object complement is not always one word. It could be a phrase.

For example:

I found the guard sleeping in the barn.
direct object – the guard
object complement – sleeping in the barn

We all consider her unworthy of the position.

direct object – her
object complement – unworthy of the position

They (subj) named (verb) Jeremy Line (direct object) their favorite player (obj complement).