Principal square root of Pauli Y gate in Qiskit?

I’ve seen a similar question asked (How do I compute the square root of the $Y$ gate?) but I’m trying to understand how I can use the gates $Y^{frac{1}{2}}$ or $Y^{frac{1}{4}}$ in Qiskit in terms of other building blocks, if it is possible.

Is there a way to use the gate $Y^{frac{1}{2}} = begin{bmatrix}
frac{1}{2}
+ frac{1}{2}i & -frac{1}{2} – frac{1}{2}i
frac{1}{2} + frac{1}{2}i & frac{1}{2} + frac{1}{2}i
end{bmatrix}$ in Qiskit? I can say that $Y = iRY(pi)$ and compute the square root manually, but how can I describe such an operation, if possible, in Qiskit?