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guess-language.el
Emacs minor mode that detects the language you're typing in. Automatically switches spell checker. Supports multiple languages per document.
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If I understand you correctly, you are talking about some other config (not your main one), that complains about missing third party library (https://github.com/tmalsburg/guess-language.el). The config you try doesn't have to install missing packages itself automatically, although it may do it, and in fact, it doesn't have to use straight.el at all. Hence this has nothing to do with chemacs2, but everything to do with the config itself and its structure. Hence, just install the library yourself in this config, but first of all check which package manager it uses.
Not to poach, but you might try this alternative: https://github.com/alphapapa/with-emacs.sh