VegaLite plot two lines and plot over

I am new with Vega-lite.

  1. Would you help me, just plot any two random lines on the one figure?

  2. Can I plot figure over another figure? something like @vlplot!()

Thank you.

This depends, but e.g.

https://www.queryverse.org/VegaLite.jl/stable/examples/examples_advancedcalculations/#Layered-Histogram-and-Cumulative-Histogram-1