Can I create mesh with blur color?

Hi everyone,
Is it possible to create a mesh in a 2D world with blur color like the picture below?

I want to draw a rectangle to represent the temperature where the light red will be the low temperature and the dark red will be the high temperature, and the color of that rectangle has the same effect like the one below.

What do you mean by that? Please add more details to your post.

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I have updated the topic.

I want to draw a rectangle to represent the temperature where the light red will be the low temperature and the dark red will be the high temperature, and the color of that rectangle has the same effect like the attached picture.

Have you already considered to draw on a canvas and then use the canvas as a texture for your mesh? This approach is demonstrated in the following example:

https://threejs.org/examples/webgl_materials_texture_canvas

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