A very kind person has created a piece of homebrew for the Nintendo Switch that allows you to upload your screenshots to lewd.pics directly from your console! It even has a neat little theme and everything to match the site theme! Once you've selected an image to upload, it will present you with the URL you can then type into wherever you'd like to share it.
The look and functionality of this software is subject to change, but as of the latest version, it's a spitting reflection of the website it's based on. Feel free to check it out!
https://github.com/HookedBehemoth/screen-nx/releases