From ClusterShell you can use the "security login role show-ontapi" command to view a list of commands and their equivalent API. According to that list, "snmp init" is the same as the "snmp-enable" API.
For the others, which are not in the list, you may be able to use the system-cli API to execute the commands. Depending on the information you want from the diagnostic commands in the second list, the information may be available as a part of the perf APIs.
Hope that helps.
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