Subscript and tilde in ggplot2 axis tick labels?

I have axis tick labels where I'd like to be able to have both subscripts and a tilde. So I have labels like "X[y]~Z[q]". If I leave them as raw text, the tilde appears fine but the y & q aren't subscripted; if I use labels=parse(text=mylabels), the subscripts work but the tilde disappears. Any suggestions?

You need to use the plotmath syntax for the tilde: X[y] %~% Z[q]


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