Confluence REST API v2 Update Content no longer has wiki body representation type

Using the old ‘Update Content’ endpoint, our body property looked like the following:

{"storage": {"representation": "wiki", "value": content}}

Unfortunately, the ‘wiki’ representation type is no longer available. How would one convert the above body to a valid body in the new v2 API?

Also, is there any documentation that provides further information on body representation types?