Hi.

You can do them using Ocean Script.

The following is examples. This is inductor case.
But it is easy also for capacitor case.
Read documents about details of Ocean.

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awvSetOptionValue('dateStamp t)
awvSetOptionValue('displayGrids t)
awvSetOptionValue("cursorPrecision" 9)
awvSetOptionValue("displayAxesBy125" t)
pi = acos(-1.0)
date = getCurrentTime()

;base_dir = getWorkingDir()
base_dir = "~"
;;
circuit_dir = "sim_ind"
sim_data = "schematic"
result_dir = strcat(base_dir, "/simulation/", circuit_dir, "/spectre/", sim_data)
openResults( strcat(result_dir, "/psf") )
selectResult("sp-sp")

y11 = yp(1 1)
y22 = yp(2 2)

Q1 = imag(1/y11)/real(1/y11)
Q2 = imag(1/y22)/real(1/y22)

L1 = imag(1/y11)/(2*pi*xval(y11))
L2 = imag(1/y22)/(2*pi*xval(y22))

fx = 3.0GHz

printf("Q1@%gGHz=%g\n", fx/1G, value(Q1, fx))
printf("Q2@%gGHz=%g\n", fx/1G, value(Q2, fx))
printf("L1@%gGHz=%g[nH]\n", fx/1G, value(L1, fx)/1n)
printf("L2@%gGHz=%g[nH]\n", fx/1G, value(L2, fx)/1n)

wid = newWindow()
addTitle("Quality Factor of Inductor")

bid = currentSubwindow(1)
addSubwindowTitle( sprintf(nil, "Q1=%g , Q2=%g at %gGHz", value(Q1, fx), value(Q2, fx), fx/1G ))
plot( Q1 ?expr '("Q1") )
plot( Q2 ?expr '("Q2") )
xLimit(list(1G, 10G))
awvSetXAxisLabel(wid "frequency [Hz]"  ?subwindow bid)
awvSetYAxisLabel(wid 1 "Quality Factor of Inductor" ?subwindow bid)

addSubwindow()
bid = currentSubwindow(2)
addSubwindowTitle( sprintf(nil, "L1=%g[nH] , L2=%g[nH] at %gGHz", value(L1, fx)/1n, value(L2, fx)/1n, fx/1G ))
plot( L1 ?expr '("L1") )
plot( L2 ?expr '("L2") )
;xLimit(list(68u, 77u))
awvSetXAxisLabel(wid "frequency [Hz]"  ?subwindow bid)
awvSetYAxisLabel(wid 1 "Inductance [Henry]" ?subwindow bid)

Connect a voltage source to the capacitor with its AC magnitude set to 1. Perform an AC analysis where you sweep the DC voltage of the source over the desired range (you are sweeping voltage rather than the frequency). Set the AC analysis frequency to 1/2π. Plot the current.

I = j2πfCV

where f=1/2π and V=1, and so I = C.

-Ken