Render single self-contained HTML file from multiple qmd files

[ylaizet]

Hi, I would be interested in being able to generate a self-contained HTML single file from a list of qmd files. The basic idea behind is to concatenate the qmd files before rendering as if it was a single file. I thought I could do it with include-in options but I realized that this is a raw inclusion, there is no rendering before.
This would allow a modular building of the output from different parts contained in separate files, as for the book rendering but in a single ouput file.
Is that already possible and I did not see it ; or would it be something useful for the community?

[mrazomej]

[cscheid]

Just to be clear, the OP wanted something that was not simply "raw inclusion", and {{< include >}} is very much raw inclusion.