Musescore 4: Ability to make custom engraving

As the title suggests I, and probaly other's, would like if there was the ability to define custom engraving. I think the process should be something like, make a file where you have some equates with the structure: "notehead=notehead.svg" where you first have the variable name and then an svg file witch contains the picture of what a notehead should look like. I think that this would be a nice quality of life feature.