Cloudflow with Spark 3.1.1 on Kubernetes

Can latest cloudflow work with latest Spark operator for 3.1.1 ?

On Adding Spark Support :: Cloudflow Guide it says

The only Cloudflow compatible Spark operator is a fork maintained by Lightbend. See Backported Fix for Spark 2.4.5 for more details.

Is it still the case that the spark 2.4 fork is required ?
What needs to be done to make cloudflow run with spark 3.1.1?

See also