The phrase "as an example/instance" is commonly used to introduce examples or specific cases relating to a given topic. There are many synonyms that can be used to convey the same meaning. Some alternative phrases include "such as", "for example", "like", "to illustrate", "to demonstrate", "specifically", "namely", "as a case in point", and "to wit". These phrases can be used interchangeably to add variety and clarity to your writing or speech. It's important to choose the appropriate phrase based on the context and level of formality you are aiming for.