Customize X axis format with B (billions) instead of G (for gigas)

What is the problem or goal the end user is trying to solve or accomplish?

User wants to be able to format the X axis with a $xxxB (for billion dollars) instead of the currently available B in default adaptive formatting or $xxxG (for gigas) with the $ formatting

How are they solving it currently?

they can't

What is the recommended solution by the Customer?

add a special format for billions dolalrs in the D3 options.
related open source discussion in the past:
https://github.com/apache/superset/issues/6916
and this could be how to implement it:
https://stackoverflow.com/questions/40774677/d3-formatting-tick-value-to-show-b-billion-instead-of-g-giga