[Python] Legend in a specific format

I am plotting a graph with a legend using the following command:

K = [1e3,1e4]
plt.plot(x[:len(y1)], y1, 'o', label=f'Simulation ($K_L$={K:0e})')


which produces the following graph:



But I want the legend to be in a specific format as presented below:

KL = 103

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