I don't know if this is what you want but still, I added this in the key binding and it helps me a lot whenever I need the terminal I go option+1/alt+1 and it opens the terminal inside sublime just like you have one in webstorm:

{
       "keys": ["alt+1"],
       "command": "terminus_open",
       "args" : {
           "cmd": "bash",
           "cwd": "${file_path:${folder}}",
           "panel_name": "Terminus"
       }
}