=> is not recognized in SQL string when dialect is postgreSQL

Consider this code:

string sql = @"select * from dbo.Report_Appointments( _start_time => {0},
                     _end_time => {1},
                     _place_id => {3});";

Rider underlines the > in red while this is perfectly valid code with postgreSQL (and schema, dialect is set to postgreSQL).

Also, it is cumbersome to set database schema per file. This should be set globally.