There has been a suggestion on the Musescore.com site for Jianpu - numbered notation. (see https://musescore.com/groups/improving-musescore-com/discuss/5076064#co…)
One reply suggests that there is a plug-in for this, though how comprehensive this is I'm not sure.
I suspect that in order to be most useful a plug-in (or feature) has to be 2-way: that is Regular notation -> Jianpu/Chinese notation, and also Jianpu/Chinese -> Regular notation.
There is also some merit in mixing the two notations, as shown in the Amazing Grace example on this web page which discusses number notations -
One reply also mentions that the Musescore.com site is for different discussions - which I have often found confusing. It would be very helpful if some clearer and more integrated method of handling discussions relating to software could be found. There is mention of this site in a side bar on the Musescore.com site, but that doesn't always appear, depending on the client software used.