r – Como plotar expressões dentro de facet_grid()?

Prezad(x)s:

Estou com dificuldades em plotar duas expressões distintas (expressão 1: "RN (MJ m"^2~"d"^-1~")", expressão 2: "ET"(0)~~" (mm"^-1*" m"^2*" )") dentro de: ggplot()+facet_grid(labeller = label_bquote(), conforme o script abaixo, São apresentados apenas a primeira expressão (Figura 1). Eu gostaria que apresentasse um com RN e outra para ET0.

Na oportunidade, caso alguém saiba, como eu poderia, plotar essas expressões dentro de labs(), para que cada uma aparecesse em seus respectivos eixos de grid, também resolveria meu problema (sem usar ggarrange(), plot_grid(), pois necessito que o eixo x, esteja fixo).

Figura 1 – Exemplo

inserir a descrição da imagem aqui

Script do gráfico:

ggplot(exe1,aes(x=Time,y=value))+
  facet_grid(variable~.,scales="free_y",labeller = label_bquote(RN=="RN (MJ m"^2~"d"^-1~")",ET0=="ET"(0)~~" (mm"^-1*" m"^2*" )"))+
  geom_line(aes(linetype=variable,color=variable))+labs(y=c(expression("RN (MJ m"^2~"d"^-1~")"),expression("ET"(0)~~" (mm"^-1*" m"^2*" )")))

dados do exemplo:

exe1<-structure(list(Time = structure(c(1607644800, 1607644800, 1607680800, 
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1608017400, 1608019200, 1608019200, 1608021000, 1608021000, 1608022800, 
1608022800, 1608024600, 1608024600), tzone = "GMT", class = c("POSIXct", 
"POSIXt")), variable = c("ET0", "RN", "ET0", "RN", "ET0", "RN", 
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