separate pre and post hooks for on_close?

I'm trying to add a command to reset the nvim-dap-ui layout when toggleterm is closed and I'm not finding a way to do this with autocmds or any existing toggleterm methods. What would be very helpful is an `on_close_post()` method that is called after the terminal window is actually closed (the `WinClosed` autocmd doesn't appear to work because nvim-dap-ui still 'sees' the layout from before the terminal was closed). Is this something you'd consider adding, or is there an existing way to accomplish what I'm trying to do that I didn't find yet? I tested adding this option to toggleterm and it works perfectly. Thank you!