setArkPsbtField appends a new unknown field to the input at inputIndex
setArkPsbtField(tx, 0, VtxoTaprootTree, myTaprootTree);setArkPsbtField(tx, 0, VtxoTreeExpiry, myVtxoTreeExpiry); Copy
setArkPsbtField(tx, 0, VtxoTaprootTree, myTaprootTree);setArkPsbtField(tx, 0, VtxoTreeExpiry, myVtxoTreeExpiry);
setArkPsbtField appends a new unknown field to the input at inputIndex