[QUESTION] How to change default font family in tool bar?

[plchekspend]

Hi @tneotia Thanks for this great package, but i'm curious about changing the default font families which provided by the package it self,

Please provide if any docs or code is available in repo,
if not then please try to provide that options as a feature request of mine and other devs also which uses this package.
it would be a great help.. thanks..