How do I have to set up my own software such that I can edit an image in it out of LR?

I wrote a simple C++ image editor where I can realise my own filters like the orton effect or sharpening an image via highpass filter like in PS. In the windows file explorer I can choose 'open in mySoftware' from the right-click menu with TIFF files and it starts my software with the file as argument. In LR I added my editor as an external editor such that I can use right click > Edit In and it starts my software but the image does not get passed. Is there any documentation about how to set up the code of an external editor for use with Lightroom?