Generating burning text is actually very easy - you just add some text, convert it into a 3d mesh - then mix it with domain and fire/smoke emitter. The only tricky thing that might cause a bit of pain - is when you do this - the fire does not show up in the 'output' render - only in the viewport! Why? You also need to add a 'volume material' to the domain.
Once you've added the volume material - be sure to set the
Blackbody Intensity
to a value other than
0.0
- otherwise the 'flame' is very dark.
After that you just tweak all the values to get the type of fire/smoke you want - set things like, fuel, density, temperature and so on.
For the script below - I've set the 'text mesh' to be 'hidden' in the output render - so you can only see the 'fire/smoke' - shape of the text generating flames and smoke (but no mesh).
Example of the output - word 'TEST' as the placeholder word on fire.
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