Bold-it is a super simple SketchApp plugin that bolds user-specified keyword in selected text layers.
Select text layer(s), then click Plugins > Bold it
and enter keyword which you want to bold.
Bold-it is integrated with Sketch Runner. Runner allows you to manage plugins and do much more to speed up your workflow in Sketch.
If you encouter bugs or have suggestions for improving this plugin,
please feel free to open a new issue or ping me on twitter.