Custom font for Custom Visual

Thanks a lot for all the inputs about customizing the font on the visual.  This is really super helpful. 

From your inputs, I understand why it's not working. I don't have the Helvetica font installed on my Windows machine. Does your answer for the enum method applies to power bi service?

Test 1: For testing purposes, I downloaded and installed some random font called "Honey Hear Regular" on my machine and I tested this enumeration code and its working fine on the Power BI desktop.  

Settings.ts

export class CircleSettings {
  public circleColor: string = "gold";
  public circleThickness: number = 2;
  public fontSize: number = 20;
  public fontFamily: string = "Honey Bear Regular, Symbol";
}

Capabilities.json

"fontFamily": {
    "displayName": "Font Family",
    "type": {
        "enumeration": [
            {
                "displayName": "Honey Bear Regular",
                "value": "Honey Bear Regular"
            }]
    }
}

Test 2: One other thing which I tried is, I mentioned "Honey Bear Regular" as the default font in the settings.ts code and I see that added to the default list (as in the screenshot below).  I tested this code and its working fine on the Power BI desktop and if I uninstall this font it fallbacks to Symbol font as I mentioned which is good. 

settings.ts

export class CircleSettings {
  public circleColor: string = "gold";
  public circleThickness: number = 2;
  public fontSize: number = 20;
  public fontFamily: string = "Honey Bear Regular, Symbol";
}

capabilities.json

"fontFamily": {
    "displayName": "Font Family",
    "type": {
        "formatting": {
            "fontFamily": true
        }
    }
}

On both these methods, when I tested the custom visual on the power bi service it does not seems to be working even when I have the font installed on my machine. Should I really go for embedding the font using CDN URL to make the font work on power bi service?

Not sure when I publish to the on-prem report server and if user access from a remote machine (I didn't test yet). In this case, I believe the above two methods should work if I have the font installed on the report server right?  I tested it on the on-prem server itself it's working fine. 

Again I really appreciate your time and effort to the Power BI community.