local variables would help reduce copy & paste repetition within formulas, without breaking how kustom works currently. They'd be accessible within the current formula field only, not in the entire object and not in the group.
lv([name], [value]) - stores a value under a name. this returns an empty string.
lv([name]) retrieves the stored value. if value wasn't set, returns empty string (or throws an error, can be either).
example in a "real" formula:
$lv(webget, tc(reg, wg(raw, "https://longurlgoeshere.com/page"), "<br/>", tc(utf, 0a)))$
result: ($tc(len, lv(webget))$ characters)
$lv(webget)$
output:
result: (1240 characters)
webpage content
content content content
(...)