As said, this is important to note that there is no co-relation between your portfolio picks. It seems what I use among the ETF and currencies, this appears to be assumed to have assets not correlated. If you use the portfolio optimization techniques I use, it measures variance and volatility. It seems to be wise to try.
As you read these article below, there is a way to get a range of -1 to +1 to measure correlation.
https://equityzen.com/knowledge-center/newsletter/non-correlated-assets-what-they-are-and-how-they-protect-your-portfolio/
https://www.investopedia.com/articles/financial-theory/09/uncorrelated-assets-diversification.asp
https://www.thebalance.com/what-is-asset-correlation-2894312
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