Created new since where?
Yesterday, last week, every day, every month?
To do this you would need a SP List or Table or something where you can insert a row every time a new item is Created andthen you would manually count them up or have another flow run every day and roll up the information.
1. Create a Flow where its trigged on a new or modified item
2. Change the Trigger, to add an expression that it only fire on NEW items (created)
3. Write a row to a sharepoint list, or flat file that just says
A new row was created, the Item id and date time
Now you are capturing every time it happens but you have to either run another flow to count them or go do that ourself.
Please mark as the answer. if this helps you.