XY Chart change grid settings

Good morning,
I'm using an XY Chart in Perspective, I wonder if and how could be reach the result of setting a different line width and dashArray of the grid as shown in the attached image

Thank you

Do you want to increase the width of grid?

I would like to increase the width of the grid only on specific rows as shown in the image, this could allowed me to "separate" some items.

You can't modify the grid. But you could add additional straight line plots and set the style as required. For an XY Chart you only need to supply two points for each line - left and right.
You might need to order the plots in the correct sequence so that the "grid" plots are behind the data plots.

I'm not sure I understood correctly—are you saying to add new points in order to create a straight line? In that case, isn't having a configuration like the one in the attached photo a problem? Right now I'm creating horizontal columns serie, so if I were to create two points, wouldn't they start from the hypothetical center of the column instead of overlapping the grid?

Post the formatted chart component JSON for your question and annotate your image so we know exactly what you're trying to achieve. That way we can copy and reproduce your configuration and edit it. Please see Wiki - how to post code on this forum.