It isn’t possible to control the look and feel of text on a form when configuring it within dynamics in an out of the box way. We recently had a requirement from a client to make some labels bold on a form and this is how we achieved it.
It can be done using a few simple steps. The labels in dynamics are stored in Unicode behind the scenes so to make these bold, the trick is to get the text in Unicode and paste it in the label. This can be used where bold or italic text is required on a form in dynamics.
You can use any online tool that generates text using Unicode characters like below:
https://yaytext.com/bold-italic/
Open the tool and type in your text. This tool will generate the bold/italic versions of the text

Click on Copy and paste the text in the label on the form. This can be a column or a section or a tab label.
Form configuration:

Record in Dynamics:

That’s it! The text will appear bold on the form. This is useful where some text needs to be highlighted on a form for better user experience and readability.