Hello,
It’s possible with the help of the theme presets. Please navigate to Theme Settings -> Settings presets -> create a condition as in the below screenshot (in the last field of the condition area you can set a particular product).
https://monosnap.com/file/gb7jooOXNHfS9DMmO8YtyoFPpfV9vj
After that, edit theme settings of this preset and navigate to Single product -> Tabs and change the HTML block.
https://monosnap.com/file/n5TKOfBZiRv0O7dx6sHaxyL72G5GVX
As a result, this specific product that you have defined in the preset condition will have another HTML block.
Also, each product has custom tabs in its settings (check the below screenshot).
https://monosnap.com/file/QS1KcyGnbZFtdfvDpDzWuPnJTQ3FKg
Here is our documentation about theme presets:
https://xtemos.com/docs-topic/theme-settings-presets/
Feel free to reach out so we can discuss possible options moving forward.
Kind Regards