BaseLib supports attaching localization to a dynamic variable, specifically adding a tooltip for any card that has that dynamic variable. The tooltip’s localization should be in static_hover_tips.json, with the localization keys being MODNAME-KEYWORD_NAME.title and MODNAME-KEYWORD_NAME.description.

Adding the tooltip is done by calling WithTooltip on the DynamicVar instance, which can be done in the constructor of a custom DynamicVariable class or by calling it on the variable when defining a card’s canonical variables.

namespace BaseLib.Cards.Variables;

public class PersistVar : DynamicVar
{
    public const string Key = "Persist";

    public PersistVar(decimal persistCount) : base(Key, persistCount)
    {
        this.WithTooltip();
        //Localization key BASELIB-PERSIST
    }

namespace BaseLib.Cards;

public class ExampleOne : CustomCard(args)
{
    protected override IEnumerable<DynamicVar> CanonicalVars => [ new DynamicVar("Name", 6) ];
    //Localization key BASELIB-NAME

public class ExampleTwo : CustomCard(args)
{
    protected override IEnumerable<DynamicVar> CanonicalVars => [ new DynamicVar("Name", 6).WithTooltip("LocKey") ];
    //Localization key BASELIB-LocKey

Example Localization

  "BASELIB-PERSIST.title": "Persist",
  "BASELIB-PERSIST.description": "This card returns to your hand the first {Persist:cond:>1?[blue]{Persist}[/blue] |}{Persist:plural:time|times} it is played each turn.",

It is important to note that tooltips generated this way will ONLY have access to their own variable. So in this case the Persist variable is the only one that can be used inside this tooltip.