The spec for this action:
https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#G11.2111850
An example of a form using this action:
https://www2.illinois.gov/rev/forms/reg/Documents/reg-1-mr.pdf
const data = this.data;
    const width = data.rect[2] - data.rect[0];
    const height = data.rect[3] - data.rect[1];
    const svg = this.svgFactory.create(width, height);
    
    
    
    const borderWidth = data.borderStyle.width;
    const circle = this.svgFactory.createElement("svg:ellipse");
    circle.setAttribute("cx", width / 2);
    circle.setAttribute("cy", height / 2);
    circle.setAttribute("rx", width / 2 - borderWidth / 2);
    circle.setAttribute("ry", height / 2 - borderWidth / 2);
    
    
    circle.setAttribute("stroke-width", borderWidth || 1);
    circle.setAttribute("stroke", "transparent");
    circle.setAttribute("fill", "none");
    svg.appendChild(circle);
    this.container.append(svg);
    
    
    this._createPopup(circle, data);
    return this.container;
  }
}
class PolylineAnnotationElement extends AnnotationElement {