You should be able to do this, yes.
See the guide:
https://learn.microsoft.com/en-us/graph/api/channel-post-messages?view=graph-rest-beta&tabs=http
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
I want to send personal message to anyone in MS Teams using graph API , Is it possible if possible how..?
You should be able to do this, yes.
See the guide:
https://learn.microsoft.com/en-us/graph/api/channel-post-messages?view=graph-rest-beta&tabs=http