[Jetbrain Plugin] How to put action under a specific group

As the image shows, I'm trying to create a very simple Action to open in VS Code what I have selected.

I expect to right click on file/directory and then Open in > Vs Code

The code I have is this:

<action id="dk.tactile.OpenInVSCodeAction"
        class="dk.tactile.packages.tactilepackage.OpenInVSCodeAction"
        text="Open In VS Code"
        description="Open the selected file or directory in Visual Studio Code">
    <add-to-group group-id="RiderRevealGroup"/>
</action>

I cannot find a way to put it inside the Open In. if a drag and drop it works.

Also, any tip to get the name of this groups? 
Documentation is pretty high level when you want to tacle something like this that looks like super simple