First, I have to say that, like you, I'm just a user.

I'm happy to try to help you, but please don't expect too much.🙈

I just want to mention that the entire RGraph code base is not required to run the php-rgraph extension.
(I think you need it later for the animations, but I haven't dealt with that yet.) 

I already have a template that includes jQuery, so I didn't think that would need it separately, sorry.

Since I did not touch anything else, where do I check the environment?, is there a file? or do I have to insert some libraries reference before in that article?

Your source code says that you don't have jQuery in your Joomla installation, I can't tell you whether that's true or how to check this.
I had instructions created for you via ChatGPT on how you can retrofit jQuery for your Joomla installation.

Integrate jQuery in Joomla If you have further and more in-depth questions, ChatGPT might be able to help you better than I can.
Otherwise, we'll have to wait for Jochen.I hope that could help you. Please excuse my English; it's not my native language.
 

hi,
your browser's console log will indicate, if jQuery is not available on your site. I've provided a new version of php-rgraph (V.2.10.14), which tries to ensure that jQuery is available. Install it via joomla updater or download/install from my site. 

Ooooh my Gooooood
It Wooooorks!!!!
Very very thanks you, Mr. Jochen!!!
Look the results in my test page:

tablero.cloudaccess.host/