Unhappy [Q] User Defined Route on Google Maps(or suggest a another app)

Hi!
i might sound like a total noob because of this question..but please forgive me..i googled and the results i got weren't that satisfying.
so just wanned to ask you guys for some recommendations and pointers for this issue of mine

I recently wanned to define my route from home to work via google maps, but unfortunately the paths( routes) all rely on main roads...but i have found a quicker route. how can manually set the path i have found to google maps...is there a third party app for this specific task, please shed some light on this matter.

Thanks
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