Creating non-modifiable activity in pull request

Is it possible to add non-modifiable activities in Pull Requests? The only way I found to add something to the activity log was to create a comment, but that can always be deleted or modified. Adding an activity like the " marked the pull request as " would solve this problem:

The only possible way I found was to implement the AbstractPullRequestActivity class, but it seems that it can only be fully implemented using internal APIs.

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