Cannot use btoa in custom api auth for self-hosted retool

Hi all,

It appears as though this is supported for Cloud organizations as stated by the reool team here: Custom API Authentication should allow the use of btoa() - #11 by Kabirdas

When using it with self-hosted retool I get the error:
Javascript Request in Step 2 failed : Error with sandbox evaluation
Step 2 is the javascript portion as follows:

const string = form1.email + ":" + form1.password;
return btoa(string);

Is there a timeline of if or when this would be added to self-hosted retool?
If it won't be added are there any workarounds?

We are on retool version 3.33.17