Create a SPICE netlist named rcsubcircuit.cir that contains a simple RC subcircuit.

.SUBCKT RC1      1
*
R1	1	2	1k
C1	2	0	0.32mF
*
.ENDS

Convert all SPICE subcircuits in rcsubcircuit.cir to equivalent Simscape files and place them in a package directory called mylibrary.

subcircuit2ssc('rcsubcircuit.cir','+mylibrary');

Netlist converted. Review files and make manual edits for any
unsupported items before building the Simscape library located
at: +mylibrary.

Check the comments at the beginning of the generated component file rc1.ssc in the mylibrary package to verify that no manual conversion is required.

Generate the Simscape library using ssc_build.

ssc_build mylibrary;

Generating Simulink library 'mylibrary_lib' in the current directory

Open the generated library mylibrary_lib.slx to access the RC component as a Simscape block.

Create a SPICE netlist named temperatureresistor.cir that contains a resistor with temperature dependence.

TEMPERATURERESISTOR.CIR - TEMPERATURE RESISTOR SUBCIRCUIT
*
.SUBCKT TemperatureResistor     p n
*
R1 p n 1k TC=0.01,-0.002
*
.ENDS

Convert all SPICE subcircuits in temperatureresistor.cir to equivalent Simscape files and place them in a package directory called mylibrary.

subcircuit2ssc('temperatureresistor.cir','+mylibrary');

Netlist converted. Review files and make manual edits for any
unsupported items before building the Simscape library located
at: +mylibrary.

Check the comments at the beginning of the generated component file temperatureresistor.ssc in the mylibrary package to identify required manual conversions.

component temperatureresistor
% temperatureresistor
% Component automatically generated from a SPICE netlist for subcircuit TEMPERATURERESISTOR.
%   MATLAB version: 9.7.
%   Simscape Electrical version: 7.1.
%   Simscape code generated on: 11-Dec-2018 09:45:20
%
% Users should manually implement the following SPICE commands in order to
% achieve a complete implementation:
%    R1: tc 0.01 -0.002

The comments suggest that you must manually convert the temperature coefficients TC.

In the components section of the component file, replace the resistor with a SPICE resistor, which models temperature dependence:

components(ExternalAccess=observe)
    R1 = ee.additional.spice_passives.res(...
        R={(1*1000),'Ohm'},...
        TC1={(0.01),'1/K'},...
        TC2={(-0.002), '1/K^2'});
end

Generate the Simscape library using ssc_build.

ssc_build mylibrary;

Generating Simulink library 'mylibrary_lib' in the current directory

Open the generated library mylibrary_lib.slx to access the resistor with temperature dependence component as a Simscape block.