Setting max attributes with ChatSetAttr?

I'm trying to make a query that sets max hp for the selected character. I think the following should work: !setattr --silent --sel --hp_max|?{Max HP?} But it doesnt seem to recognize hp_max for some reason. Setting hp works fine with the same command. Am I missing something or does setattr not work with _max attributes? Anybody knows a workaround?

What character sheet are you using?  The D&D 5E sheet doesn’t have a separate attribute for max hit points for example. The reference for the max value of an attribute is another vertical pipe, such as @{selected|hp|max}.  Y ou’d need to use --hp||?{Max HP?} if my memory serves me correctly on the syntax. 

ChatSetAttr  sets the max value for an attribute with another pipe character and the following value. Assuming you were using the D&D 5e sheet with the hp attribute !setattr --sel --hp||?{Max HP?} That should set the max value for the hp attribute

Thank you both so much, that did the trick! And yes, I am using D&D 5e. Sorry, should have probably mentioned that :) For context, this is part of a macro I'm using to quickly generate player tokens for improvised sessions. The macro asks for character Name, Race (affects token appearance), HP, AC, and Initiative bonus. My players use D&DBeyond for their sheets, so I only need to set these attributes to run the game in Roll20. !token-mod --on showname --set controlledby|all has_bright_light_vision emits_bright bright_distance|0 bar1_link|hp bar2_link|ac --set name|?{Name} --set currentside|?{Race/Gender|Human (male),1|Human (female),2|Elf (male),3|Elf (female),4|Dwarf (male),5|Dwarf (female),6|Halfling (male),7|Halfling (female),8|Gnome (male),9|Gnome (female),10|Half-Orc (male),11|Half-Orc (female),12|Tiefling (male),13|Tiefling (female),14|Dragonborn (male),15|Dragonborn (female),16|Aarakocra (male),17|Aarakocra (female),18|Tabaxi (male),19|Tabaxi (female),20} --on has_night_vision --set night_vision_distance|?{Has night vision?|Yes,60|No,0} !setattr --silent --sel --hp||?{Max HP?} --hp|?{Max HP?} --ac|?{AC?} --initiative_bonus|?{Initiative?} Thanks again guys, this really made the whole thing complete.

Hi Axiomsyndrom,  Just to clarify, there are multiple D&D 5e character sheets in Roll20. Whenever you reference Character Sheets in Roll20 it is a good practice to state the name of the character sheet you are using, or provide a screenshot so that it can be identified.