It is not implemented in the SparkRunner at the time I am making this comment.

You can follow https://github.com/apache/beam/issues/22524 which is a feature request ticket to implement it.

I found that ticket by browsing the code to understand the status - it is linked from https://github.com/apache/beam/blob/5e29867ba53d940e6d5a2e0fdc25a883ab1547de/runners/spark/src/main/java/org/apache/beam/runners/spark/translation/TransformTranslator.java#L409. (contributions welcome!)