Corrected Q: Bathtub drain slow; snake stops at J-bend under floor.

Glued plastic drain pipe is accessible in unfinished basement ceiling of 2008 home I own. Want to manually unclog every year, like basin & sink easy, without costly Drano which doesn't work well. 1/4" manual snake down thru overflow, stops at J-bend. Do I pay a plumber to customize plumbing?
corrected q bathtub drain slow snake stops at j bend under floor, plumbing
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