If it's an elaborated trim and your piece has a "twin" trim that you can use to replicate the missing one, you can hot glue or silicon mold to make a mold and build a new trim with wood filler. Here is how I did it with this chest leg.
I'm not sure how big the area is, but I like to use epoxy wood filler. It doesn't expand or shrink, easy to work with, and dries quickly so you can sand/paint/stain.
I recently bought a table and chairs that need restoring. The table and chairs have been sitting in a metal storage container for a long time and the wood has dried ...
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We found beautiful mid-century modern blonde dining suite in a thrift store. It seriously needs repair. I want to keep this blonde finish. How do i do it?
If it's an elaborated trim and your piece has a "twin" trim that you can use to replicate the missing one, you can hot glue or silicon mold to make a mold and build a new trim with wood filler. Here is how I did it with this chest leg.
https://youtu.be/ikpNKYuuBJw
Good luck!
I'm not sure how big the area is, but I like to use epoxy wood filler. It doesn't expand or shrink, easy to work with, and dries quickly so you can sand/paint/stain.
https://www.lowes.com/pd/J-B-WELD-Wood-Repair-Epoxy-Putty/999985990
Here a project that might help
https://www.hometalk.com/diy/repair/furniture/repair-that-missing-trim-37624897
Repair That Missing Trim
If you post a picture that would help us help you.