Theme in Power BI

Hello,

I would like to ask how to override a theme in power BI? 

{"name":"Metricalist - Power BI Windows 11 Theme","visualStyles":{"page":{"*":{"background":[{"color":{"solid":{"color":"#202020"}},"transparency":0}],"outspace":[{"color":{"solid":{"color":"#DFDFE9"}}}],"displayArea":[{"verticalAlignment":"Middle"}]}},"*":{"*":{"outspacePane":[{"backgroundColor":{"solid":{"color":"#DFDFE9"}},"foregroundColor":{"solid":{"color":"#323447"}},"checkboxAndApplyColor":{"solid":{"color":"#60CDFF"}}}],"filterCard":[{"$id":"Applied","backgroundColor":{"solid":{"color":"#FCFDFE"}},"foregroundColor":{"solid":{"color":"#323447"}},"transparency":0},{"$id":"Available","backgroundColor":{"solid":{"color":"#F1F2F7"}},"foregroundColor":{"solid":{"color":"#323447"}},"transparency":0}],"background":[{"color":{"solid":{"color":"#2C2C2C"}}}],"border":[{"color":{"solid":{"color":"#2C2C2C"}},"show":true,"radius":5}],"visualHeader":[{"background":{"solid":{"color":"#2C2C2C"}},"foreground":{"solid":{"color":"#F8FAF7"}},"border":{"solid":{"color":"#2C2C2C"}}}],"visualTooltip":[{"titleFontColor":{"solid":{"color":"#262735"}},"valueFontColor":{"solid":{"color":"#2C2C2C"}},"background":{"solid":{"color":"#F8FAF7"}}}],"visualHeaderTooltip":[{"titleFontColor":{"solid":{"color":"#262735"}},"background":{"solid":{"color":"#F8FAF7"}}}],"dropShadow":[{"position":"Outer","show":false,"color":{"solid":{"color":"#000000"}}}]}}},"dataColors":["#005FB8","#60CDFF","#777777","#459BAC","#D0000C","#696CB5","#CCCCCC","#000000","#3599B8","#DFBFBF","#4AC5BB","#5F6B6D","#FB8281","#F4D25A","#7F898A","#A4DDEE","#FDAB89","#B687AC","#28738A","#A78F8F","#168980","#293537","#BB4A4A","#B59525","#475052","#6A9FB0","#BD7150","#7B4F71","#1B4D5C","#706060","#0F5C55","#1C2325"],"textClasses":{"label":{"fontFace":"wf_standard-font, helvetica, arial, sans-serif","color":"#F8FAF7","fontSize":10},"callout":{"color":"#F8FAF7","fontSize":9,"fontFace":"'Segoe UI Bold', wf_segoe-ui_bold, helvetica, arial, sans-serif"},"title":{"color":"#F8FAF7","fontFace":"'Segoe UI Bold', wf_segoe-ui_bold, helvetica, arial, sans-serif","fontSize":9},"header":{"color":"#F8FAF7","fontSize":9,"fontFace":"'Segoe UI Semibold', wf_segoe-ui_semibold, helvetica, arial, sans-serif"}},"bad":"#60CDFF","neutral":"#CCCCCC","good":"#005FB8","minimum":"#60CDFF","center":"#CCCCCC","maximum":"#005FB8","foreground":"#F8FAF7","foregroundNeutralSecondary":"#CCCCCC","backgroundLight":"#262735","background":"#323447","foregroundNeutralTertiary":"#ADAEB5","backgroundNeutral":"#848591"}

I have a theme JSON code. Is possible to define visuals, other elements in this json, I have tried to defined stacked bar chart but not successfull because after define nothing has changed.

If you wish to customize the theme, this article will help:

Themes and custom themes in Power BI 

There are aslo free tools to help, such as:

https://themes.powerbi.tips/