Re: How create property string in power bi custom?

Iam not really sure the question is answered already.

So here my Example Code: 

"start": {
                            "displayName": "Start",
                            "description": "Start Position",
                            "placeHolderText": "data.createDisplayNameGetter('Visual_Precision_Auto')",
                            "type": { "text": true },
                            "suppressFormatPainterCopy": true
                    },

That working fine. Do you implement the function behind that object?

You need to implement the getValueFunction:

start: getValue<string>(objects, 'categoryAxis', 'start', defaultSettings.categoryAxis.start),

And in theenumerateObjectInstances. After that you should see the object in the formatoptions.