Problem with BUBBLE CHART scale and legend

Lately I am working with Bubble Charts and I noticed two problems that I cannot solve.

(1) Comparing multiple Bubble Charts that have dissimilar bubble size data is not possible. The problem is that if you use the same size multiplier, the bubbles in each chart have the same size, despite the difference in bubble size values. For example the bubble sizes of the next 2 tables are similar:
X1: 2, 3, 4, 5; Y1: 4, 3, 2, 1; Bubble1: 4, 3, 2, 1
X2: 2, 3, 4, 5; Y2: 4, 3, 2, 1; Bubble2: 0.4, 0.3, 0.2, 0.1
Of course there are some ways to overcome this problem, but they cause a lot extra work or are not dynamic. I am looking for a Macro or VBA procedure that generates bubble sizes in multiple charts that are sized according to the same bubble size scale.

(2) I also noticed that Bubble Charts in Excel don’t have a proper legend: they only inform about the third dimension (e.g. revenues). I am looking for a legend that informs the user about the bubble sizes and their values or ranges. A fourth dimensions can even be included in the charts: ‘colour of the bubbles’. Also for this matter I would like to have a clear legend.

My question: is there any macro or VBA procedure for including information about bubble size and bubble colour in the legend of the bubble chart?
Hopefully, someone can help me: you will help me a lot!