Set attribute within macro

I would like to have an ability called Beacon which I add to my healing macro. I want my initiative macro to set Beacon to 0 and my Beacon macro to set it to 5. When I use my healing macro before my Beacon macro, the healing is done with +0...after I do my Beacon macro, any healing macro is +5 IF API is needed, then my GM could insert code if someone knows how to write this Example /em Zed rubs some dirt on you. You can use a healing surge and add [[3d6+@{Beacon}]] INITATIVE /em A Initiative roll has been made. [[1d20 +@{selected|Initiative} &{tracker}]] somehow set @{Beacon} to 0 BEACON /em Zed shines a Beacon of Hope on the Battlefield... somehow set @{Beacon} to 5

You can't without using the API or a character sheet sheetworker script. Which requires a pro subscription.

For a free account you could have a token on each page that has the bars set to your desired values (which you could then update as needed during play). It isn't the most elegant but for global modifiers it is often quicker to hardcode macros and manually update a single value in this way than to set up a roll query to query the value each time. In this example you would have bar1 for your beacon of hope token: Example /em Zed rubs some dirt on you. You can use a healing surge and add [[3d6+@{beacon of hope|bar1}]]  INITATIVE /em A Initiative roll has been made. [[1d20 +@{selected|Initiative} &{tracker}]] Manually set beacon of hope token bar1 value to 0 BEACON /em Zed shines a Beacon of Hope on the Battlefield... Manually set beacon of hope token bar1 value to 5