Hi @Timthetic!
It's not possible as a native setting yet 
. The closest options would be:
Calculating each row color somewhere else, perhaps in a temporary state that returned a value like ['red','blue','blue','red'] and then using the same {{ tempState.value[i] }} as the background color setting in each column.
You could also do this using CSS (How to write custom CSS in Retool!), but you'd need to generate dynamic CSS by mapping the rows of the table and selecting the correct table indexes