How can I check what capabilities a CSI driver has? One way I know is to parse the following html page:
https://kubernetes-csi.github.io/docs/drivers.html
But I would like to know if there is a a better way / API call to query this.
I'm not aware of any API that contains that kind of information and based on this disclaimer:
DISCLAIMER: Information in this table has not been validated by Kubernetes SIG-Storage. Users who want to use these CSI drivers need to contact driver maintainers for driver capabilities.
I highly doubt that there is one. For checking available Kubernetes API resources you may want to have a look at the API reference.