Use custom fields contained in the post to edit the content.

Hello, I would like to be able to use custom fields within the post in order to add them to the prompt. It would be useful if we had an option that when selecting from the list of prompts for writing the text, it was not necessary to select any text, just process the prompt by loading the data from the custom fields configured in the prompt. I tried adding, for example, %%!texto_legenda!%%, the custom field caption_text is present in my post. However, when the text was processed, it added the code in the returned text, and did not use the content of the custom field in the prompt to generate the text. I must say again, it would be very useful if we had an option that, when selecting from the prompt list for writing the text, it would not be necessary to select any text, just process the prompt by loading the data from the Custom Fields of the post configured in the selected prompt.