图例比例热图

Question

下午好

我将尝试在Heatmap Graph上更改图例比例，这是我的代码，并且我想更改值显示的符号。预先感谢Miguel。

Heatmap Image

rfm_heatmap(rfm_result, plot_title = "RFM Heat Map",
        plot_title_justify = 0.5, xaxis_title = "Frecuencia",
        yaxis_title = "Recencia", legend_title = "Valor Monetario Medio",
        brewer_n = 4, brewer_name = "PuBu")