Question: How to set color on notification

[FlashLim]

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• I have searched existing issues and this is not a duplicate.

Environment

• Platforms: Android
• Android version: 10

Issues and Steps to Reproduce

I try to setup template with the value of "color": "#000000" received with an error,
it seems like # cannot be accepted by the template since template has their own expression.

May I know how to escape # ? I tried unicode and various way of escaping but not working..

Expected Behavior

setup template with "color": "#000000" without error and receive notification in the color stated.

Actual Behavior

setup template with "color": "#000000" received with an error.