Valid only for `<text>` subelements. `textPath` can be either a string or an object.

If it is a string, it specifies a path the text will be rendered along.

If it is an object, then it can contain a `d` property that specifies the path the text will be rendered along. Alternatively use `selector` property, which is useful for targeting a specific SVGPathElement within the shape. The option expects a string selector (CSS or JSONMarkup selector). Use `startOffset` property to control the text position on the path (e.g. `'50%'`, `20`). See the `Vectorizer.text` method for more details.