This quick post comes courtesy of LianTze Lim (an Overleaf TeXpert) and Kota Miura (a bioimage analyst). I asked on the ImageJ forum some time ago how to add an ImageJ Macro lexer for a LaTeX document I was writing. Kota responded with this lexer for pygments. I then asked Overleaf if it was possible to add a custom lexer to an Overleaf document using the minted package. At the time this was not possible.