A list of all available cluster tasks or operations

Hi all,
I want to get a list of all available cluster tasks
I am using this end point to retrieve the current tasks http://<ip>:8091/pools/default/tasks, it works good as it returns a list of objects for the current operations, but is there an endpoint that would return all possible operations ?

the other way around would be to run the operation then call the end point to check it is type name, but I think the list would be available some where.

Thanks