Cusotm Component: Enter Dynamic Text into builder properties

I’d like to be able to enter some text (either in a read-only field to just the text itself) into a custom component’s properties.

Something like this:
{
    id: “signee”,
    type: “text”,
    label: “Signee”,
    disabled: true, //User should not be able to edit
    value: signee // Need to enter the value from a variable
}

Is there a supported way to enter a value dynamically based on other information within the component’s builder-side definition?