New nested tag inherit parent tag customizations

[Teo-ShaoWei]

I am hoping that new nested tags will inherit customizations from the parent tag. For now, that's just the colour, but eventually, if #10 goes through, then inherit the icon too.

I can help to contribute code if it helps 🙏

[denho]

Thank you for the suggestion, @Teo-ShaoWei. I've marked it as Planned.