Patch or Update column from sharepoint site page with Power automate

felipewltc From where you want to update your choice column? From SharePoint library view itself or from Power automate flow only?

1. SharePoint library view: You can make a choice column editable from view itself using JSON formatting. Check this documentation: Inline Editing 
2. Power Automate: You can use Update file properties action to update the choice column in site pages library. If you don't see the "Site Pages" library in "Library Name" property in action, select Enter custom value option and then enter "Site Pages" manually like: 

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