text object size limits / capabilities

I would like to put a very long string value into a special text property in my formatting pane.

This property is defined as an object in capabilities.json

It displays in the UI with a red outline.  Is there a limit to the size of a text input?  How do you recommend handling long text inputs?

export interface ValueTypeDescriptor {
    text?: boolean;
    numeric?: boolean;
    integer?: boolean;
    bool?: boolean;
}