I am currently working ona clustered column chart in Vega where in if the values in the category are positive and negative, they are going to be stacked in one column but if the values in the category are both positive or both negatives then they must be displayed side by side instead of stacked.

Is there a way to still display the y axis lines even with the data on both bars being all all zero values?

Let’s say I still want to display minimum of 2 grid lines such as the attached desired outcome screenshot below. 1, 0.5, 0, -0.5, 1

Thanks. Appreciate the help.