Zeplin automatically fetches all text styles in a Figma document when you export any frame or component from it.
These text styles will be suggested under the Text Style Catalog section in your styleguide or your project’s Styleguide tab. You can add them all using the “Add All” button or add individual colors by click on the ones you want separately.
You can choose to ignore these suggestions by clicking “Ignore these text styles”. When you do this, Zeplin will no longer show suggested text styles in this styleguide again. To see suggested text styles again, you can reset this setting by opening a project or a styleguide and selecting “Help > Reset Suggested Text Styles” from the menu up top.