Problem with Knit Components

Im a beginner in Knit, and the issue i stumbled upon is lack of info about it. Most of it is outdated, or if is not, its just not enough.
Because of this I’m a bit struggling with components. I want to access to component’s property, but everytime when I try to get component instance, it only has 3 properties: Instance, Active, Starting signal. There are no properties that I made myself for component.
I have tried to look into Knit’s code also, but it seems that it must let me access the properties, but it doesn’t.

Component code example
function MyComponent:Construct()
 self.message = "hello world!"
end
Component property usage code example
local component = ThatComponent:FromInstance(instance)
print(component.message) --prints nil
print(component.Instance) --prints instance's name