ASM/AWAF declarative policy

Thanks Nikoolayy1, that documentation could be done better. There is, for example, missing API endpoint, it should be POST to /mgmt/tm/asm/policies. But then the payload (the last example in this page) does not correspond to it as whole declaration is under key "policy". BUT when I try to deploy it to /mgmt/tm/asm I get 501, when I try to deploy it to /mgmt/tm/asm/policies I get 400. I am worried whether this is not one of the dead end cases like iWorkflow, AS3 in container etc.. Is this still well sustained and supported solution or was it one time try? I will maybe create support ticket for this