What would happen if you walked between a lifesize parallel capacitor with an air gap?
E field is measured by Volts/meter.  We know the reduction of C due to point, line and parallel surfaces have different exponents of distance. So let’s reduce this to a simple 1D problem with series Caps of different values.
We know the smallest series cap has the highest impedance and largest voltage drop in a string of caps.
In a simulation the body dielectric which is mostly water with a dielectric constant of 80 relative to air and a slightly conductive+insulative skin as electrodes when contact is made.
So what is the charge voltage created by inserting a large C in series with very small C air values?  This depends on the dimensions voltage and C values but can be very small induced voltage.
Yet AC is not the same as DC if the R ratios are not the same. This is analogous to RC balance of a 10:1 scope probe.
Beware of creapage resistance depends on air/surface contamination ratios and humidity will affect the risks Of voltage inducement.
Bigger risk
By inserting a dielectric in the air gap you are reducing the breakdown voltage of the air , normally 1kV~3kV/mm.  Conductor sharpness with E-field gradients create more stress and thus lowers the breakdown voltage.  So don’t even think of standing between HV lines without a proven Faraday suit.