Icon FX -- Rules hard coded?

carlol , You can color measure and icon measure, but in that case you you need use icon measure as different value(column) and use conditional formatting on that using field value option

example

/////Arrow
Arrow =
var _change =[Net Sales YTD]-[Net Sales LYTD]
return
SWITCH (
TRUE(),
_change > 0, UNICHAR(9650),
_change = 0, UNICHAR(9654),
_change < 0, UNICHAR(9660)
)

/////Arrow Color
Arrow color =
var _change =[Net Sales YTD]-[Net Sales LYTD]
return
SWITCH (
TRUE(),
_change > 0, "green",
_change = 0, "blue",
_change < 0, "red"
)

UNICHAR - Tool for Custom Icon Formatting: https://www.youtube.com/watch?v=veCtfP8IhbI&list=PLPaNVDMhUXGaaqV92SBD5X2hk3TMNlHhb&index=50

https://exceleratorbi.com.au/conditional-formatting-using-icons-in-power-bi/
https://community.powerbi.com/t5/Desktop/FORMAT-icon-set-for-use-in-a-data-card/td-p/811692

https://exceleratorbi.com.au/dax-unichar-function-power-bi/