Should top actions dropdown items support custom images in addition to Fluent icons?

What type of issue is this?

Question

What SharePoint development model, framework, SDK or API is this about?

💥 SharePoint Framework

Target SharePoint environment

SharePoint Online

What browser(s) / client(s) have you tested

• 💥 Internet Explorer
• 💥 Microsoft Edge
• 💥 Google Chrome
• 💥 FireFox
• 💥 Safari
• mobile (iOS/iPadOS)
• mobile (Android)
• not applicable
• other (enter in the "Additional environment details" area below)

Additional environment details

• SPFx 1.18.2

Issue description

Hi,

Looking at the documentation for Top Actions it looks like we should be able to set imageSrc and selectedImageSrc properties in order to render a custom image for a top action dropdown item. We would like to use this for scenarios where there is not an appropriate Fluent icon and we still want to show an image-based icon.

https://learn.microsoft.com/en-us/javascript/api/sp-top-actions/itopactionsdropdownoption?view=sp-typescript-latest#@microsoft-sp-top-actions-itopactionsdropdownoption-imagesrc-member

I've tried out both an image string path and base64 encoded string for imageSrc and selectedImageSrc and no image is shown. Is this expected? If not, is there a reason why this wouldn't be supported the same way we add images to choice group web part properties?

Thanks!