Tab groups not very clear

I find that the Tab groups with Brave are not very clear, with Chrome everything is separated with margins and rounded corners for the group names. The group line is also separated from the tabs.

Whereas with Brave, everything is glued, the group name is lower than the tabs, the corners are not rounded, and the line underlining the group tabs is glued to the tabs.

Can we modify a configuration file to get the Chrome style in the display of Tab groups?