I'm pretty sure krunker on mobile is just an embedded version of the website, so it doesn't have any il2cpp files as a normal unity mobile game would. To get mods on mobile, you would have to either:
1) Execute something as a script of sorts.
2) Use game guardian/another memory editor.
3) Extract assets/decompile/dump the webgl version, modify it, recompile it, then re-upload it on a site to play? Not sure how you would do it, might be something cool to look into.