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1) How I can I add vertical reference lines in Combo Chart?
I though of using reference lines , but no such option
2) How to display value labels in combo chart?
Neither options are available for a Combo chart.
Vertical reference lines are also rare - only used in Scatterplots and charts which are presented horizontal.
In case you really need it, I guess your best option is to look for an extension.
You could use a 3rd expression to create another bar for where you want reference line.
However it doesn't look so good as it will create space between all other bars.
It looks marginally better if you change the bars to markers as per the attached but still not great.
Try Qlik Branch
Given our situation we are not looking for any extension sincewe would like to host this on Qlik Sense cloud.