Plotting predicted values (marginal effects) of panel data models (fixed effects)

I am having a very hard time generating a marginal effects plot for my model with fixed effects. Packages such as jtool::effect_plot or sjPlot:plot_model seem to be the most effective way to do this. However, my model is a plm and I have had no luck with these packages. If I run a simple linear model (lm) then they work just fine.

Anyone have suggestions for plotting marginal effects of a plm with fixed effects?