How can I open a new empty tmux pane when I am working in Vim?

Let's say I am working on an .html (or any text-based) file in vim. Next, I need to open a new pane to work on the terminal. How can I achieve that?

I know how to use tmux to open a new pane and then go into vim. But how do I do this instead from vim, to open a new tmux pane with a terminal?

Thanks.