No. Those operations are only available via the corresponding Exchange Online PowerShell cmdlets, no Graph API support yet.
Threat assessment API: Configure policies

Macháček Martin
56
Reputation points
Does threat assessment API supports configuration of the following policies?
- Anti-phishing
- Anti-spam
- Anti-malware
Accepted answer
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Vasil Michev 66,331 Reputation points MVP
2022-01-30T08:15:19.23+00:00 1 additional answer
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Raj 31 Reputation points
2022-09-07T08:03:16.653+00:00 Is there any time in mind for this to be of the graph API?
This will be REALLY very helpful.
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Not sure what you mean by "apply some policy to a threat assessment". Threat assessment requests are basically the equivalent of admin submissions, a way to send a message (file/url) for re-examination by Microsoft. Basically, you use it to get a second opinion on why a given item was (not) marked as spam/malware. Nowhere in the process you need to specify or modify the policies mentioned above. Those are not configurable via the Threat assessment API.
Read more about the admin submissions feature here: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/admin-submission?view=o365-worldwide
I've read about admin submissions feature but I couldn't find any info how to configure admin submissions via Exchange Online PowerShell cmdlets.
If I want to let admin to decide what to do when a user send a report how can I configure via powershell that the report from user won't be send directly to Microsoft but only to a tenant admin in User reported message view?