Hi Hari,
It isn't currently possible to configure the data labels further - they are either visible or not.
The reason the data count isn't displaying on your stack elements is because there isn't enough room for it to fit. This is due to the unallocated work column being so disproportionate to the rest of the data.
Please do go ahead and create a new idea which matches your use case in our portal: https://big.ideas.aha.io/. Our team frequently review ideas and always appreciate input for our customers.
Best,
Simone
All I need is some config around enabling or showing labels even when datacounts are low/less.