Sublime text sftp rsa private key - json

Question

I'm trying to set up a private rsa key for sublime text to access the ftp like in filezilla. So far so good, the plugin stfp/ftp is working fine, but I've no idea on how I can set up the key to access a private server.
Here's an example of my json file:
"type": "sftp",
"sync_down_on_open": true,
"sync_same_age": true,
"host": "example.com",
"user": "username",
"password": "password",
"port": "22",
"remote_path": "/example/path/",
//"file_permissions": "664",
//"dir_permissions": "775",
"connect_timeout": 30,
"ssh_key_file": "~/.ssh/id_rsa",
So the thing is that this snippet "ssh_key_file": "~/.ssh/id_rsa" should do the work but I need to know: 1. Where I should put the file that I have (key.ppk) and 2. Do I need something else to make it works?
Thank you in advance for any help.

Answer 1

It's actually doable:
{
// The tab key will cycle through the settings when first created
// Visit http://wbond.net/sublime_packages/sftp/settings for help
// sftp, ftp or ftps
"type": "sftp",
"sync_down_on_open": true,
"sync_same_age": true,
"host": "111.111.111.11",
"user": "admin",
"password": "password",
"port": "22",
"remote_path": "/",
//"file_permissions": "664",
//"dir_permissions": "775",
//"extra_list_connections": 0,
"connect_timeout": 30,
//"keepalive": 120,
//"ftp_passive_mode": true,
//"ftp_obey_passive_host": false,
"ssh_key_file": "C:/Program Files/Sublime Text 3/mykey.ppk",
//"sftp_flags": ["-F", "/path/to/ssh_config"],
//"preserve_modification_times": false,
//"remote_time_offset_in_hours": 0,
//"remote_encoding": "utf-8",
//"remote_locale": "C",
//"allow_config_upload": false,
}

Answer 2

Sublime Text 3 (v 3.2.2)
Finally succeeded, moving the .ppk file to a path without spaces.
"ssh_key_file": "C:/Users/Me/mykey.ppk"