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a suggestion:

Plot.barY(search4, Plot.groupZ({y: "proportion-facet"}, {y: "orders", title: "name", fill: "name"})),
    Plot.text(search4,Plot.stackY( Plot.groupZ({y: "proportion-facet", text: "first"}, {y: "orders", text: "name", z: "name"}))),

(quick explainer: the texts were under the bars, and text doesn't stack by default)

@Fil yes, that worked! Thank you!!