First, you need a 12-mm x 22-mm label that can print text. Of course, you can also write it by hand. The recessed part of the model is just the right size to fit a 12-mm x 22-mm label. You can also cut it to the same size and paste it in. However, the size of this color card may cause some Chinese characters or symbols to be too blurry or impossible to print in Chinese. Therefore, I have modified the color card sample again.

First of all, you need to have a 12mmx22mm label that can print text. Of course, you can also handwrite it. For the concave part of the model, you can just put a 12mm x 22mm label on it, or you can cut it to the same size and paste it in. However, the size of this color card may make some Chinese characters or too many characters appear very blurry, or you may not be able to print Chinese characters at all. So I re-modified this color card sample.

The storage and use of the color swatches are done usingSwatch Display Board by Bambu Lab from Bambu Lab - MakerWorld

Other color swatches

Labeled transparent color cards/Color cards with transparent labels. Secondary creation - from Evan76 - MakerWorld

Labeling color card with ironing - Secondary creation - From Evan76 - MakerWorld