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The inlet data are required to be Fourier approximated in the Simvascular, namely the Fourier Modes.
Do we have any method to avoid such an approximation and use the original input?

If you don't want the solver to process your inflow data, you may manually modify bct.dat file to impose the desired nodal velocities.
It has the following form:
np nl
x1 y1 z1 nl nn
vx1 vy1 vz1 t1
. . . .
. . . .
. . . .
vxnl vynl vznl tnl
. . . .
. . . .
. . . .
xnp ynp znp nl

vx1 vy1 vz1 t1
. . . .
. . . .
. . . .