In Pythagora vs code extension, how to use OPENROUTER's api_key?

[y2241]

I don't have openapi app_key but I have OPENROUTER api_key. What I need to change in the config.json to use OPENROUTER?
The current default config.json is:
{
"llm": {
"openai": {
"base_url": null,
"api_key": null,
"connect_timeout": 60.0,
"read_timeout": 10.0,
"extra": null
}
},
"agent": {
"default": {
"provider": "openai",
"model": "gpt-4-0125-preview",
"temperature": 0.5
},
"CodeMonkey.describe_files": {
"provider": "openai",
"model": "gpt-3.5-turbo",
"temperature": 0.0
},
"Troubleshooter.get_route_files": {
"provider": "openai",
"model": "gpt-4o",
"temperature": 0.0
}
}
Could you tell me where and what to change? Or it is hard coded to only use openapi's api_key? The README says that in command line (not vscode extension), we can use OPENROUTER.