Can you please reproduce the use case scenario with fake data in QlikView and share with us the screenshot? This will allow us to understand what exactly you are trying to achieve.
If you would like to make the values within a Straight table bigger for example, you can do that easily with the latest version of Qlik Sense. You will have to go to "Appearance > Presentation > Styling" and play around with the values there.
An potential outcome is:
The text is not bolder, but it is bigger. If this is what you are looking for but instead you want to make it bolder, you can submit a feature request .
I hope that this information was helpful. In case I have misunderstood the use case scenario, please elaborate in details by providing additional information. However, if it has helped you resolve the issue, addressed your concerns or at least pointed you in the right direction, please mark it as Accepted Solution to give further visibility to other community members.