I wonder, is there a similar metric that tracks the average monthly mortgage payment over time instead? I think for most people's purposes that's a more relevan

I wonder, is there a similar metric that tracks the average monthly mortgage payment over time instead? I think for most people's purposes that's a more relevant number and won't have the confounding factor of interest rates (except to the extent that interest rates influence home prices, so maybe this would end up mirroring the case shiller index?)