How to replace the IT system symbol and additional participant known from Signavio

Dear community,
what is the best way you’d suggest replacing the IT system symbol that I know from Signavio and miss in Camunda?
It looks like this:
image
Should I just use an annotation?

And what about the additional participant?
It looks like a person and shows someone participating in a process (e.g. consulting) without being the mainly responsible person for this task.

I’m using the web modeler, the search feature in this forum could not help me.

Thank you in advance!

Kind regards

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Can you show an example of these being used in a model, just for a little more context about how the symbols work.

Business Process Model & Notation - BPMN Introductory Guide | Signavio