[Resolved] GP equivalents to GB-buttons-presets

Hi,

I’m trying to apply the general GP-button settings to the GB-buttons, as per this post.

But I want to extend it a bit more to also the button-typography. But I can’t get it to work.
What I’m looking for are the GeneratePress-equivalents to the following GenerateBlocks presets:

'fontFamily' => '',
'fontFamilyFallback' => '',
'googleFont' => false,
'googleFontVariants' => '',
'fontWeight' => '',
'fontSize' => false,
'fontSizeUnit' => 'px',
'textTransform' => '',
'letterSpacing' => '',

Greatly appreciated if you can point me in the right direction.