Frame font and rotation

Hello everyone, I would like to change the font size of frame coordinates (second picture ). The default font size of coordinates is big. And finally also I would like to rotate the labels (left; see second picture). Thanks to all.

Doc : font-parameters

Maybe this one too : https://docs.generic-mapping-tools.org/dev/gmt.conf.html?highlight=font%20angle#term-MAP_ANNOT_OBLIQUE

Thank you very much