[gatsby-source-contentful] Request images as progressive JPEGs

[davidpaulsson]

The image fragments support webp and all that and that's all good, but is there a way to request images as progressive JPEGs? For my use-case, I cannot use webp but would do the second-best option. Basically, I want to tack on ?fm=jpg&fl=progressive to the image requests.

https://www.contentful.com/developers/docs/references/images-api/#/reference/changing-formats/progressive-jpegs/retrieve-an-image/console/js