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If it is above all an impedance adaptation that you are looking for, it is easier to use an 'L' adapter. It will be low pass or high pass. You will choose it as impedance step-up or step-down.

You can consider that a pi-adapter consists of 2 L-adapters one behind the other. For example on a classic pi: capacitor in parallel, inductor in series, capacitor in parallel, you cut (in your mind) the inductor in two. The one on the right is step-down and the one on the left is step-up. They are both low pass.

A pi is especially of interest when the adapter must be fairly universal. This is not your case since you are going to measure your antenna with your nanaoVNA. The adaptation will be fixed (raise or lower).
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Fran?ois F1AMM