Most of this code is managed just through the settings that you set in the Adobe Analytics extension.
I'm not sure which fields here you are specifically referencing, but the CustomSetup key I believe refers to if you decide to change the the library management... (i.e. "Manage Library for Me" vs "Use the Library Already Installed on the Page", etc)
The Library Code... this is all generated by what you place into the extension.... the "company" key, I believe comes from Adobe (basically the alias/id for your company under which your suites sit), this doesn't need to be explicitly set, because in this case, the extension manages it; likely getting the value based specifically on the suite you have chosen.
The "Source" value is the scripts that you have put in the Custom Code editor in the extension... so that is all code managed by you.
I wouldn't exactly call this "metadata", as generally that means more data which gives classification and additional information to provide context.... what you are looking at is more like the generated code that is created by the all the information you placed into the extension interface.
So basically... you manage this... it's just that Adobe Launch is generating the code for you from the user interface that you are interacting with.