is it possible to add some note in flowchart diagram ?
It's possible a with gantt diagram
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It is not possible right now. What kind of not do you mean? I can see general notes to be placed anywhere and notes related to some node, then that relation needs to be defined.
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I would be great to put a note beside any decision or square.
For example to use a smaller space:
graph TD;
Buyer -->|press buy| Product
Product --> Shared{Has Been Shared}
Shared -->|No| D[Show message saying 'Invite your friends to chat on Onova' Ok or Cancel]
Shared -->|Yes| ProductAvailable{Product is Available?}
On Shared -> No I want to give more context.

This could be implemented by creating a hidden subgraph with two nodes, the actual node and the node with the note.
I would suggest synax similar to notes in plan uml state diagrams.
Product --> Shared{Has Been Shared}
note left of Product : this is a short<br />note
note right of Product
A note can also
be defined on
several lines
end note
State or Sequence Diagram wouldn't make a lot of sense for me. I have few code paths I'm trying document and, for example, this is just the beginning:

@gianpaj Note that the suggestion was to use a similar syntax to PlantUML's state diagrams for the development of the feature. Not for you to use state / sequence instead of flowcharts.
No activity on this for a while (understandably), just wondering if still the case that we'd need to use a workaround? Have used the syntax that @knsv describes in plantuml.
Most helpful comment
@gianpaj Note that the suggestion was to use a similar syntax to PlantUML's state diagrams for the development of the feature. Not for you to use state / sequence instead of flowcharts.