Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

gap_ppcp : ble_dev_params_tag
GE : APSR_Type , xPSR_Type
get_dummy_bytes_cb : qspi_callback_t
get_event_state_completed : bas_client_callbacks_t , cscs_client_callbacks_t , hrs_client_callbacks_t , scps_client_callbacks_t
get_ref_time_info : cts_callbacks_t
get_sc_control_point_state_completed : cscs_client_callbacks_t
get_time : cts_callbacks_t
GP_ADC_CLEAR_INT_REG : GPADC_Type
GP_ADC_CTRL2_REG : GPADC_Type
GP_ADC_CTRL3_REG : GPADC_Type
GP_ADC_CTRL_REG : GPADC_Type
GP_ADC_OFFN_REG : GPADC_Type
GP_ADC_OFFP_REG : GPADC_Type
GP_ADC_RESULT_REG : GPADC_Type
GP_ADC_SEL_REG : GPADC_Type
GP_STATUS_REG : GPREG_Type
gpio : timer_config_oneshot
gpio1 : timer_config_timer_capture
gpio2 : timer_config_timer_capture
gpio3 : timer_config_timer_capture
gpio4 : timer_config_timer_capture
GPIO_CLK_SEL_REG : GPIO_Type
gpio_output_mode : hw_pcm_config_t
gpio_sense : wkup_config