You have an option to convert an sketch to image but also add option to convert image into an sketch. Although there are options already available but AI and Photoshop should be much levels up.
Although Photoshop has some older sketch options in the Filter Gallery (Filter > Filter Gallery...), have you tried the Style Transfer Neural Filter (Filter > Neural Filters... and toggle on Style Transfer) where you can either use style presets or customize a style using your own image?
@shivendrab are you asking for a module in Firefly for an Image to Sketch module?
If you're providing feedback about the Neural filters that @Myra Ferguson mentioned in Photoshop, please create a post here in the Photoshop Ecosystem Community. Share why you think it needs to be improved and a screenshot of your examples is super helpful. 🙂