Cannot set SNMPv3 parameters on host via REST API

Guess what I’m looking for would be the webapi command line version of setting this:

I’ve tried this and variations so far with no luck:

curl "cmkhost/cmksite/check_mk/webapi.py?action=add_host&_username=automation&_secret=SECRETSTRING" -d 'request={"hostname":"snmponlyhost","folder":"folder/subfolder","attributes":{"site":"cmksite","tag_agent":"snmp-v3"},"snmp_community":{"auth_password":"password","auth_protocol":"SHA-1-96","security_name":"secname_here","type":"v3_auth_noprivacy"}}'