Summarize Multi-Footnotes

[frogg]

Hello,
I am using goldmark via Hugo for a blog.
For scientific purposes, we make quite some use of the footnotes [^1] feature.
However, sometimes there are multiple footnotes provided for the same word, e.g
…Research suggests[^1][^2][^3][^4][^5][^6] various associations of smartphone use…

This turns out to look very ugly:

It would be great if multiple footnotes are separated by comma e.g. [1,2,3,4,5,6], or even better: summarized, e.g. [1-6]