Is there a way to map ctrl+h and backspace to different functions?

[roachsinai]

if I set 'c-h' only, backspace will do same thing as ctrl+h, just like below:

    registry.add_binding('c-h', filter=(HasFocus(DEFAULT_BUFFER) & ViInsertMode()))(nc.backward_char)

And 'c-?' is not allowed to add_binding.

Is there a way to make it as many terminal can distinguish c-h and <bs>.

If for compatibility, is it possible to support bind c-??

Thanks in advance.