pine script - Volume value label is not shown on vertical volume's value bar

Question

I am trying to create simple volume bar chart in trading view pine editor. but the today's market's value(it also called price line) of volume(last bar) is not shown in the right side bar ,normally as like as red market price label on price bar. In its settings, in style tab, there is a switch for turning on price line, but it does not work too and only show the price's horizontal line, not its value label on side bar. After showing it, I also need to change its style and color based on some conditions. I upload the sample image, I mean volume value label as like as red market price label in top window(candle stick chart) I would appreciate if anyone can help me to solve it.

// This source code is subject to the terms of the Mozilla Public License 2.0 at https://mozilla.org/MPL/2.0/
// ? reza_najafi

//@version=4
//Main volume bar chart
study(title="IV", format=format.volume)
plot(volume, color= color.green,style=plot.style_columns, title="Volume bar's color")
hline(0, title='Zero line', color=color.gray, linestyle=hline.style_dashed, linewidth=1)

question from:https://stackoverflow.com/questions/65940813/volume-value-label-is-not-shown-on-vertical-volumes-value-bar

Answer 1

You can show the line with trackprice=true, but I'm not sure if you can add a label.

//@version=4
//Main volume bar chart
study(title="IV", format=format.volume)

plot(volume, color= color.green,style=plot.style_columns, title="Volume bar's color", trackprice=true)
hline(0, title='Zero line', color=color.gray, linestyle=hline.style_dashed, linewidth=1)