Specific values in contour lines

Plotly R, MATLAB, Julia, Net Plotly R
1

I would have to specify the line value but with a different contour scale, i.e. the lines of this figure:

contour plot with 0.1 size

0.1
0.1778×626 61.9 KB

But with the scale of this one:

contour plot with 0.01 size

0.01png
0.01png778×626 153 KB

With the code for the first image:

plot_ly(data = TRW_Gamir, x = ~TRW_Gamir, y=~coef_spei1_TRW.month, z=~value, 
        type = "contour", colorscale ="Jet" , showscale= TRUE, 
        line= list(width=0.5, color="black"), 
        contours = list(start = -0.3, end = 0.6, size = 0.1, showlabels = T))

And for the second:

plot_ly(data = TRW_Gamir, x = ~TRW_Gamir, y=~coef_spei1_TRW.month, z=~value, 
        type = "contour", colorscale ="Jet" , showscale= TRUE, 
        line= list(width=0.01, color="black"), 
        contours = list(start = -0.3, end = 0.6, size = 00.1, showlabels = F))

The final figure has to be like this:

Captura