Hi I am not sure you can do this. However, you can add publications into google scholar manually. Also, publications in google scholar appear automatically when you activate it. Hope this helps you.
Try to have exactly the same title of the paper which you intend to share on Researchgate and SSRN. Then add the article manually on Google Scholar. After some days Google scholar will capture both sources. Afterward, whenever some cites your work, you will be notified.