This tool allows you to manage your custom colour palettes in Tableau without ever looking at XML. Just upload your preferences file (or start from scratch), add any colour definition you might have and create your palettes.
Then download your new file and off you go!
This tool is also available as a Figma Plugin here.
If you want to support me and this tool, you can subscribe to get updated on new releases, let your friends and colleagues know or donate to my tea budget!