You can right now … except it is a paid service … https://element.io/blog/element-one-all-of-matrix-whatsapp-signal-and-telegram-in-one-place/
this post was submitted on 16 Jun 2024
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As far as I know, the Signal protocol was chosen to be the intermediary layer between the existing platforms. Matrix protocol was a candidate, but was not chosen.
Still, if you wish to use a bridge between Matrix and some other platform, then you can either set one up yourself or try to find a Matrix server that already has such bridge set up. https://matrix.org/ecosystem/bridges/