Under a single request, you can requisition multiple data that are related.
As a guide for FOI officers (the people who will process your request), the State Government of Victoria gives this gloss:
Practice Note 4: Multiple Requests for Access
Multiple requests arise where a number of applications for access are made by
or on behalf of a person at the same or within a short period of time
(e.g. within 2-3 weeks).
If there is sufficient commonality between the requests, they can be
considered as a single request to determine whether it is a
"voluminous" request under section 25A(1).
Each request should otherwise be treated individually, in the usual
If it is not reasonably possible to notify a decision to the applicant
on each request within 45 days, subject to the FOI Act, take practical
steps to consult with the applicant about priority of requests and to
possibly reduce their scope.
- Note: references in this Practice Note to sections are references to
sections of the Freedom of Information Act 1982 (Vic) ("FOI Act")
unless otherwise stated.
I have experience requisitioning such data (i.e., warranted by FOI) from commonwealth government law enforcement agencies.
The specific protocol (e.g., email, web form[s], and/or paper form[s] to submit) for filing a freedom of information request will depend on the agent or agency to whom you're submitting it.
Typically, the agency will ask you to state the specific data you want under a single subject heading so that the scope of their response is appropriate to your request.
See How to make a freedom of information (FOI) request by the UK Government Digital Service here: How to make a freedom of information request