I want to set μg / m³ in a label, but I can’t find in lv_font_montserrat how to set μ and ³. Is it possible to customize the font and add these characters ? How can I do it? Thanks in advance.
What MCU/Processor/Board and compiler are you using?
You probably have to create your own custom font. LVGL actually has an online font converter that you can use to create your own font, with whatever characters you need
You should use a custom font with your special characters and either load it dynamically (runtime), or include & compile with your source code (.bin -> .h conversion needed)
Please see my comment where to find free fonts, check the glyphs (characters) inside font files (point 3), and how to generate “LVGL-compatible” .bin files: