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NFC Antenna Tuning?

I have a product which uses the nRF52840 SoC that will also have NFC functionality. The housing of the PCB is sort of forcing a custom design for the NFC Antenna. 

We need an antenna in a coil shape (rather than the square loop antenna the 840 DK comes with). Are there any resources or direction when interfacing a custom NFC antenna design on the 840 DK? Is this something I can utilize the antenna tuning service for?

Our current approach is to try and size up a copper wire loop with a calculated number of turns to match the tuning circuity on board the 840 DK to get the 13.56MHz field. Would this be the right approach?

Thanks, 

Sam

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