Wix is unable to rescale an object through html on the page itself.
A solution would be to use a iframe and simply load the svg and said changes in the html code in there which also allow you to communicate different values etc. though again, you are unable to change the iframe size itself at runtime.
You have to decide on a size and stick with it until Wix become more responsive.
You could set an area off on the page and use iframe or the new content window (beta so not sure you have access to that) that way you can change the image size itself but if it become larger than the iframe itself scroll bars or cutoffs will happen.
Hope this helps a bit