Posting an arrangement for a composition which is not on the composers page

[SchnurrenbergerPeter]

I have made an arrangement of Ave Maria of the Composer Giulio Caccini. Caccini has a composer page (https://imslp.org/wiki/Category:Caccini%2C_Giulio). The Ave Maria is not on this page as nobody has yet published it on IMSLP. Normally, if I want to publish an arrangement I go to the page with the original music and add it there. How can I publish my arrangement if - as in this case - there is no original music page? I cannot create the original music page as I don't have the original music.

[ScoreUpdater]

You can still create a page for the original work by Caccini, even if you don't have sheet music of his original composition. Go to his composer category page and hover over Toolbox, then click Add Work. On the following webpage, fill in all the information you know about the composition, then add your arrangement as usual; there doesn't need to be a scan of the original composition for you to do this.

[Melodia]

That piece is not by Caccini

https://en.wikipedia.org/wiki/Ave_Maria_(Vavilov)