Hello. You can do it following this.

Make sure editor data is installed.

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Create a new Addon. Select Load data from Story and Target it for Story.
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Open level browser. Hit Show Inherited Levels to show levels from main campaign. Find FortJoy. Open it
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In World Outliner search for ‘Lohse’
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Check out the object using this button

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You will be able to edit properties of the character. You are interested in Visual Set Indices

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Click inside the field with numbers, there will be a tiny button with 3 dots, click it to edit the property.

There are selectors for different visual properties. You are looking for face type, hair, and colors of those.

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Change the settings and don’t forget to save. Also when the window will be closed, don’t forget to hit save the project itself.
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Start the game. Go to mods. Activate your mod. Don’t forget to confirm.

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Start new campaign. This is our new Lohse.

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Meet her in game.