I was looking to access and change the properties that can also be found on the instance's data within the project layout json file (left-margin, right-margin, origin, seams, etc.).
{	"type": "ThoughtBubble",
	"properties": {
		"left-margin": 2,
		"right-margin": 7,
		"top-margin": 1,
		"bottom-margin": 5,
		"edges": "stretch",
		"fill": "stretch",
		"initially-visible": true,
		"origin": "top-left",
		"seams": "exact"
	},
}