How to change fontSize capability limits.

Hi,

I have following problem: i can't define limits of the fontSize  (apparently the upper one is 40 and the lower is 8). Additionaly I have not got a slider beside the input number:

My capabilities.json :

 "objects": {
        "customProperties": {
            "displayName": "Custom Properties",
            "properties": {
                "title": {
                    "displayName": "Title",
                    "type": { "text": true }
                },
                "rotation": {
                    "displayName": "Rotation",
                    "type": { "numeric": true }
                },
                "textSize": {
                    "displayName": "Text Size",
                    "type": {
                        "formatting": {
                            "fontSize": true
                        }
                    }
                }
                
                }
            }
    }

My settings.ts:

import DataViewObjectsParser = powerbi.extensibility.utils.dataview.DataViewObjectsParser;

export class VisualSettings extends DataViewObjectsParser {
  public customProperties: customPropertiesData = new customPropertiesData();
}
export class customPropertiesData {
  public title: string = "Title";
  public rotation: number = 0;
  public textSize: number = 100;
}

Anyone knows a solution? I would be grateful.

Michal