Every residue has a name and an identifier: if you know the number, you know the name; and so you can replace the residue identifiers with residue names, if that is what you want, in any plotting program.

If the protein has 300 residues, there would be 300 labels on the X-axis, which would require the X axis to be stretched really wide to make the labels readable, which is why people usually use residue identifiers on the X-axis.

Thank you! Martin Klvana. I have got the point.