New to Golang and Wails, missing something on the runtime context

[choff5507]

Im sure Im missing something but after reading the docs I am still a little confused about how to properly be able to access the runtime methods. Lets use this example to illustrate and Im hoping someone can educate me on what I am doing wrong.

Looking at the docs here:
https://wails.io/docs/guides/application-development

I do what they say which is create a new instance of the struct (empty) and then set the context on it accordingly. Id like to be able to unmarshall some json into the struct that looks something like this:

type DeviceData struct { Data interface{} ctx context.Context }

and then be able to log it to the console for example with something like this:

func (d *DeviceData) PrintData() { runtime.LogPrintf(c.ctx, "%v\n", c.Data) }
However, when I do this I see an error that says

cannot call 'github.com/wailsapp/wails/v2/pkg/runtime.LogPrintf': An invalid context was passed. This method requires the specific context given in the lifecycle hooks:

Im guessing this is because the instance that I am unmarshalling into is different than the new one created in wails main.go file.

So, Im sure this is a newbie mistake but if I have a defined package, a struct and methods defined. How do I properly access the context so that I can call something like the method outlined below and it has the needed context.

Thank you!