Hello, Nik.
Unfortunately, this feature that you need cannot be reached by our standard system.
Currently, there is no way to create a new Query in the Feeds screen and it is not possible to change the default query, which is set as "All Updates" in the standard system.
What I advise you to do is to reach one of the channels bellow so SAP can release this feature to you:
1 - Post your request in the collaboration forum, where you can request for new features for the new releases of the system.
https://ideas.sap.com/ct/ct_list.bix?=SAPCloudforCustomer
2 - For urgenty matter, you may contact your implementation manger to help with your request or approach directly the SAP Cloud Servuce Center via e-mail: servicecenter@sap.com
Thank you and best regards,
Artur Olschowsky
Support Consultant
SAP Cloud Product Support