Where can I find more detailed information about the STWBC86JR?

The usual place would be the Product Page for the device; in this case:

https://www.st.com/en/power-management/stwbc86jr.html

Presumably, you've seen that the information there is very sparse?

When this happens, it's because you need to contact ST direct (possibly under NDA):

• Raise a support case here: https://ols.st.com/s/
• Or contact your sales office or Distributor: https://www.st.com/content/st_com/en/contact-us.html