That is OK.
The size can be samller, even 0.5mm
https://easyeda.com/Doc/Tutorial/PCBOrderFAQ#PCB-Dimension
https://easyeda.com/Doc/Tutorial/PCBOrderFAQ#Panel-by-EasyEDA
We can help the chip company to build test board.
The price is not cheap in the size less than 1cm, will add some cost.
How to do? use cut hole tech. try to think. If can't, forget it, because you don't need such samll PCB :)
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