Hi Daniel,
The process to SSRS integration with Web API is a bit complicated: firstly we need to run localhost webform.
In the webform class file, with ActiveDirectory library for AAD authentication to connect to Dynamics 365 to execute msdyncrm_LoadInteractionsPublic API, then convert the response data to XML format.
https://www.codeproject.com/Tips/986958/SSRS-Report-Integration-With-Web-Api
Alternatively, I would suggest calling the API directly in flow and create a csv from response data.
Overview of the flow

Action 1
msdyncrm_LoadInteractionsPublic is an unbound action

Action 2
Parse the Data property of response to JSON with sample JSON payload.

[
{
"SendingId": "121764e4-62b1-1b89-ef36-5b779aedb5e9",
"ContactId": "bf5c52e1-022b-eb11-a813-000d3aa080ec",
"EmailAddressUsed": "clofly@test.com",
"EmailDomain": "test.com",
"MessageId": "8a68c12e-b027-eb11-a813-000d3aa080ec",
"CustomerJourneyId": "8273746d-572d-eb11-a813-000d3aa080ec",
"CustomerJourneyIterationId": "5e663f77-4531-4532-b70b-da4473319ce1",
"UsageType": "CustomerJourney",
"ActivityId": "bf845412-1acc-d44d-422e-364519cfe9d6",
"OrganizationId": "26d382eb-326c-47f8-93f4-4ecd22c245a8",
"InteractionType": "EmailSent",
"Timestamp": "2020-11-23T06:46:48.6080000 00:00"
},
{
"SendingId": "d2b5f0f6-1c76-6918-be7e-ae01a82d5f89",
"ContactId": "bf5c52e1-022b-eb11-a813-000d3aa080ec",
"EmailAddressUsed": "clofly@test.com",
"EmailDomain": "test.com",
"MessageId": "8a68c12e-b027-eb11-a813-000d3aa080ec",
"CustomerJourneyId": "57edf92a-5a2d-eb11-a813-000d3aa080ec",
"CustomerJourneyIterationId": "6c776ac5-6e38-4817-b805-0d03bc362b1a",
"UsageType": "CustomerJourney",
"ActivityId": "b77b8f42-4e7f-300b-68f3-c835337bb8b9",
"OrganizationId": "26d382eb-326c-47f8-93f4-4ecd22c245a8",
"InteractionType": "EmailSent",
"Timestamp": "2020-11-23T07:06:06.4000000 00:00"
}
]
Action 3:
Create a CSV table from Body of the parsed JSON

Action 4:
Create a csv file from output of action 3 and save it to OneDrive.

Result
The converted file in OneDrive folder:

CSV content:

Regards,
Clofly