Painting frames on bitmap layers, HELP

Good afternoon! I am working as a clean up artist on a project and I wanted to know if there’s ANY way to avoid using the brush tool to fill the gaps the paint bucket cannot reach when painting on a bitmap layer. Here’s a snapshot attached of what I mean. I was wondering if Toon Boom has an equivalent tool as photoshop’s “Select > Modify > Expand or Contract”, or if its any other way that could save me years of painting. Thank you very much.

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