Their intentions can be whatever they want, unless they are going to massively rewrite the story itself, none of the woman in this story win the Iron Throne. My guess seeing how going off script massively blew up in their faces last time, they will probably stick to the story itself this time.
Again I don't know the source material except through osmosis and what was established in GoT. The way they talked about Rhaenyra in that show, she is apparently a pretty badass Targaryen so I have no problem if they portray her that way.