Hello. I can help. What size and length? Do you want to go vertically into the bottom or into the side. Top flange or bottom flange?
I would strongly recommend against hanging that type of load off the bottom flange in that manner. If the bottom flange separates from the web, you can have a very serious problem.
I would use 2x blocking between the joists with joist hangers and fasten into the bottom of those.
Hello, how are you doing? Do you have any other questions for me on this topic? If you could rate my answer, I would appreciate it.