ETH Kimchi Premium (KRW vs US)

This indicator calculates and displays the Kimchi Premium of Ethereum (ETH) spot prices between a selected Korean exchange and a selected U.S. exchange.
The Kimchi Premium is defined as the percentage difference between the ETH price quoted in Korean Won (KRW) and the ETH price quoted in U.S. Dollars (USD),
converted using the current USD/KRW foreign exchange rate.

Formula:
Kimchi Premium (%) = ((ETH_KRW/USD_FX) - ETH_US) / ETH_US × 100

Features:
- Configurable Korean ETH/KRW symbol, U.S. ETH/USD symbol, and USD/KRW FX symbol
- Option to calculate on a custom timeframe independent of the chart timeframe
- EMA smoothing of the premium to reduce noise
- Raw premium and smoothed premium plot options
- Optional data table showing converted prices, FX rate, and premium values
- Alert condition when absolute premium exceeds a user-defined threshold
- Visual spike marker when threshold is crossed

Typical Use:
Traders use the Kimchi Premium as a sentiment and arbitrage indicator. A large positive premium often signals strong buying interest in Korea,
while a negative premium can indicate selling pressure or weaker demand compared to U.S. markets."