@maffreitas, unfortunately this custom visualization does not install on Splunk Enterprise 7.
But, as per the sample screenshots provided on Splunkbase seems like your statistical table can have three columns i.e. name, value, color where in third column you can give color hex code . Have you tried it out?
Can you try the funnel Visualization with the following run anywhere search?
| makeresults
| eval name="Field1",value="100",color="#ff634d"
| append
[| makeresults
| eval name="Field2",value="1000",color="#008080"]
| append
[| makeresults
| eval name="Field3",value="2000",color="#007fff"]
| append
[| makeresults
| eval name="Field4",value="5000",color="#ff634d"]
| table name value color
... View more