How can I simulate an OLTC transformer with tap settings on the secondary side in Simscape?

I need to model an on-load tap changing (OLTC) transformer where the tap changer is connected on the secondary winding. I found the Three-Phase Tap-Changing Transformer (Two Windings) block in the Specialized Power Systems library: https://in.mathworks.com/help/sps/powersys/ref/threephasetapchangingtransformertwowindings.html

However, this block only supports tap changing on the primary side.

👉 Is there a block that allows secondary-side tap changing directly? 👉 If not, what’s the recommended workaround to achieve the same behavior?