:nth-last-of-type

Since UXP v3.0

Matches only the Nth child of a given type from the end. Can use an expression or even or odd.

See: https://developer.mozilla.org/en-US/docs/Web/CSS/:nth-last-of-type

Example:

.row:nth-last-of-type(even) {
    background-color: #E8E8E8; 
}