@IberianLynx Thanks for reaching out. Assuming that you want to send single email to individual emails rather than sending one email to all the email ID's and the json object is defined as below
{
"to": "******@email.es, ******@email.es, ******@email.es",
"body": "<h1>Hello</h1>",
"subject": "Registration of an event"
}
Workflow:

You can change the above workflow and add individual names as per your input and customize it as per your need. You can refer to this document to know more about outlook connector. In case if you only need to send one email to all the email ID's then you need to remove the for each statement and use replace in the emaiList.
You can refer to function reference for more details on the available functions in logic app.
For your reference sharing the Code View with array and Code View without array
The above is only for reference and you can modify it as per your requirement. Feel free to get back to me if you need any assistance.
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